I'm going to go through each one in alphabetical order listing everything I recall each company doing (only with regards to gaming) that is anti-consumer. Feel free to correct or add on to anything wrong or anything I missed.
Microsoft
-Have tried to buy the gaming market. Microsoft bought so many exclusive rights or timed exclusives, it's not even funny. Remember they tried to buy their way into the Japanese market with buying games like Blue Dragon and Lost Odyssey. There's times Nintendo and Sony made a few deals to get exclusives like Nintendo with RE on GameCube and Sony buying Square stock (which I'm sure wasn't merely just to help out Square as reported). However, it wasn't until Microsoft jumped into the market do we start seeing the number of exclusive deals greatly jump up along with a huge rise in timed exclusives and even timed exclusive content.
-Paywalls all over the place.Remember when Microsoft makes you pay for Live to utilize features and services that have nothing to do with Live. With 360, you had to pay for Live to watch Netflix or use Facebook; with Xbox One, you have to pay to use Hulu and Amazon, you even have to pay to be able to record gameplay or use Internet Explorer. Of course, Microsoft ushered in the online multiplayer paywall that Sony and now Nintendo have followed suit with. Microsoft didn't even put an internet browser on the 360 to make paying for "free internet stuff" that much more necessary, even freaking Nintendo's Wii had an internet browser.
-RROD (Red Ring of Death). I can't believe I forgot this one in the original post. Microsoft had to have known about 360's hardware issue because of how quickly and frequent it occurred and thus they released to beat Sony out the gate and get a year head-start. Sony's PS3 had a similar problem as console makers have to switch over to lead-free solder but at least the PS3 issue took years for a hardware failure and I doubt Sony would have known about the issue beforehand.
-Xbox 360 proprietary hard drive. Instead of just being able to stick in a laptop hard drive into the 360, you had to buy one from Microsoft.
-Being against cross-platform play. When Microsoft was on top during the 360 gen, they denied cross-platform play with Sony. Sony returning the favor will be mentioned in the Sony section.
-Games for Windows Live. Its DRM coupled with the fact that games were made unplayable when it was shutdown because of said DRM no longer being able to be authenticated.
-Xbox One and it's DRM shit storm. It was so bad Sony "won" E3 by showing a used game instructional video [https://www.youtube.com/watch?v=kWSIFh8ICaA]. Obviously, Microsoft basically reneged on it all at basically the last second as you can tell the Xbox One had that DRM stuff gutted out of it just by the fact you can't do anything with a new Xbox One until you connect it to the internet (I'm hoping Microsoft has eventually fixed that).
-Xbox One's forcing the Kinect on people. Obviously, tons of people don't like the Kinect and didn't want to pay for it yet Microsoft made people buy a Kinect if they wanted an Xbox One and eventually reneged on that too a year or so after release of the console.
Nintendo
-Not nice to 3rd parties. Nintendo is notoriously not nice to 3rd party publishers (even during their heyday on top with NES/SNES) and charged higher licensing fees than the competitors while also having their consoles (N64/Gamecube) use inferior physical media. Basically, Nintendo handed Sony so many great games during the N64/PS1 era that they basically gave Sony the market for free. This attitude has caused Nintendo systems missing out on a lot of games that its consumers could've been able to play.
-Delaying a Zelda game to launch with a new system (not once, but TWICE). Both Twilight Princess and Breath of the Wild were ready for Gamecube and Wii U but Nintendo held off releasing them for a killer app for the soon to be released new system. Nintendo even had the gull to release Twilight Princess on Gamecube AFTER the Wii version was released.
-Nintendo's copyright claims. Not much needs to be said here as Nintendo's Youtube copyright claims are completely ridiculous.
-Artificial hardware scarcity. Nintendo purposefully doesn't make enough hardware so that all their products can utilize the "sold out" marketing to make their product look more popular and in the end hopefully get more total sales. This makes dedicated Nintendo fans have to pay more for something because of scalpers snatching them up and selling them on eBay.
-Amiibos AKA limited supply of costly on-disc DLC. Of course, Nintendo just doesn't let you buy such content digitally if you don't want the plastic figure. Sure, amiibos as a way to unlock in-game unlockables is fine but several recent games have content only unlocked by amiibos. Of course, you have the whole scalper thing with amiibos too.
-Downloaded and sold a ROM of Super Mario Brothers to its consumers when actively denouncing ROMs and emulators. Nintendo being hypocritical as fuck basically.
-Online paywall. Soon to come to the Switch.
Sony
-PlayStation 3. After riding high with PS1 and PS2, Sony thought nothing could stop them. The PS3 released as an expensive console that Sony thought would just sell based on the brand name alone. It was also a play to Trojan horse blu-rays into consumers homes that did work much like the PS2 with DVDs (but at least a new media was needed because CDs were too small). Sony did lose money on every PS3 sold for quite awhile so it didn't really have to do with Sony printing money on the backs of consumers but more to do with making a system the consumer really didn't want.
-Removal of Linux support (from PS3). Even though a very small amount of people used Linux on PS3, it was a pretty bullshit move making people choose between keep using Linux without updating and not being able to play online (and just play games that require newer firmware) or losing Linux as a feature. Sony lost a class-action lawsuit over this.
-PSN hack. Getting hacked in and of itself isn't anti-consumer but it really did seem like Sony's network security was extremely lacking and possibly even what you'd call a joke.
-Online pass. I THINK Sony is the only one of the big 3 to at any time utilize online passes for its 1st-party games.
-Against cross-platform play with only Microsoft this gen. Sony is most likely just returning the favor to Microsoft for last-gen.
-Exclusivity. Sony has a bunch of exclusivity deals as well.
-Mod support. Sony has been pretty tough and difficult with regards to mod support. I'm guessing that is do to opening up hacks to the system like what happened with PS3 but that's not a good enough excuse.
-Online paywall. Started on PS4.
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-Microtransactions/lootboxes. SO FAR, I think Microsoft has been the biggest offender with just Forza 7 alone even though they have the least exclusives right now. I don't know of / recall any Sony 1st party games with such elements. Same thing with regards to Nintendo.
Microsoft
-Have tried to buy the gaming market. Microsoft bought so many exclusive rights or timed exclusives, it's not even funny. Remember they tried to buy their way into the Japanese market with buying games like Blue Dragon and Lost Odyssey. There's times Nintendo and Sony made a few deals to get exclusives like Nintendo with RE on GameCube and Sony buying Square stock (which I'm sure wasn't merely just to help out Square as reported). However, it wasn't until Microsoft jumped into the market do we start seeing the number of exclusive deals greatly jump up along with a huge rise in timed exclusives and even timed exclusive content.
-Paywalls all over the place.
-RROD (Red Ring of Death). I can't believe I forgot this one in the original post. Microsoft had to have known about 360's hardware issue because of how quickly and frequent it occurred and thus they released to beat Sony out the gate and get a year head-start. Sony's PS3 had a similar problem as console makers have to switch over to lead-free solder but at least the PS3 issue took years for a hardware failure and I doubt Sony would have known about the issue beforehand.
-Xbox 360 proprietary hard drive. Instead of just being able to stick in a laptop hard drive into the 360, you had to buy one from Microsoft.
-Being against cross-platform play. When Microsoft was on top during the 360 gen, they denied cross-platform play with Sony. Sony returning the favor will be mentioned in the Sony section.
-Games for Windows Live. Its DRM coupled with the fact that games were made unplayable when it was shutdown because of said DRM no longer being able to be authenticated.
-Xbox One and it's DRM shit storm. It was so bad Sony "won" E3 by showing a used game instructional video [https://www.youtube.com/watch?v=kWSIFh8ICaA]. Obviously, Microsoft basically reneged on it all at basically the last second as you can tell the Xbox One had that DRM stuff gutted out of it just by the fact you can't do anything with a new Xbox One until you connect it to the internet (I'm hoping Microsoft has eventually fixed that).
-Xbox One's forcing the Kinect on people. Obviously, tons of people don't like the Kinect and didn't want to pay for it yet Microsoft made people buy a Kinect if they wanted an Xbox One and eventually reneged on that too a year or so after release of the console.
Nintendo
-Not nice to 3rd parties. Nintendo is notoriously not nice to 3rd party publishers (even during their heyday on top with NES/SNES) and charged higher licensing fees than the competitors while also having their consoles (N64/Gamecube) use inferior physical media. Basically, Nintendo handed Sony so many great games during the N64/PS1 era that they basically gave Sony the market for free. This attitude has caused Nintendo systems missing out on a lot of games that its consumers could've been able to play.
-Delaying a Zelda game to launch with a new system (not once, but TWICE). Both Twilight Princess and Breath of the Wild were ready for Gamecube and Wii U but Nintendo held off releasing them for a killer app for the soon to be released new system. Nintendo even had the gull to release Twilight Princess on Gamecube AFTER the Wii version was released.
-Nintendo's copyright claims. Not much needs to be said here as Nintendo's Youtube copyright claims are completely ridiculous.
-Artificial hardware scarcity. Nintendo purposefully doesn't make enough hardware so that all their products can utilize the "sold out" marketing to make their product look more popular and in the end hopefully get more total sales. This makes dedicated Nintendo fans have to pay more for something because of scalpers snatching them up and selling them on eBay.
-Amiibos AKA limited supply of costly on-disc DLC. Of course, Nintendo just doesn't let you buy such content digitally if you don't want the plastic figure. Sure, amiibos as a way to unlock in-game unlockables is fine but several recent games have content only unlocked by amiibos. Of course, you have the whole scalper thing with amiibos too.
-Downloaded and sold a ROM of Super Mario Brothers to its consumers when actively denouncing ROMs and emulators. Nintendo being hypocritical as fuck basically.
-Online paywall. Soon to come to the Switch.
Sony
-PlayStation 3. After riding high with PS1 and PS2, Sony thought nothing could stop them. The PS3 released as an expensive console that Sony thought would just sell based on the brand name alone. It was also a play to Trojan horse blu-rays into consumers homes that did work much like the PS2 with DVDs (but at least a new media was needed because CDs were too small). Sony did lose money on every PS3 sold for quite awhile so it didn't really have to do with Sony printing money on the backs of consumers but more to do with making a system the consumer really didn't want.
-Removal of Linux support (from PS3). Even though a very small amount of people used Linux on PS3, it was a pretty bullshit move making people choose between keep using Linux without updating and not being able to play online (and just play games that require newer firmware) or losing Linux as a feature. Sony lost a class-action lawsuit over this.
-PSN hack. Getting hacked in and of itself isn't anti-consumer but it really did seem like Sony's network security was extremely lacking and possibly even what you'd call a joke.
-Online pass. I THINK Sony is the only one of the big 3 to at any time utilize online passes for its 1st-party games.
-Against cross-platform play with only Microsoft this gen. Sony is most likely just returning the favor to Microsoft for last-gen.
-Exclusivity. Sony has a bunch of exclusivity deals as well.
-Mod support. Sony has been pretty tough and difficult with regards to mod support. I'm guessing that is do to opening up hacks to the system like what happened with PS3 but that's not a good enough excuse.
-Online paywall. Started on PS4.
---
-Microtransactions/lootboxes. SO FAR, I think Microsoft has been the biggest offender with just Forza 7 alone even though they have the least exclusives right now. I don't know of / recall any Sony 1st party games with such elements. Same thing with regards to Nintendo.