Ah but they can make it very hard for you to pay.The fundamental fallacy of Laissez-Faire Economics is that while the government can't interfere, there are little to no checks and balances on the companies themselves. You'll get a slap on the wrist like the break up of Facebook because of a monopoly, but most companies start from humble beginnings and the successful ones own lobbying firms to get their tax breaks complete with the government applauding their acts on one hand and accepting their bribes with the other.
Big Corps are either going to invent new avenues with shiny new brand names that don't point back to the parent, or use their tax breaks for Mergers and Acquisitions existing properties.
That's Capitalisms.
But I wasn't issued my state-ran telephone number and decided that I wanted the private option. A phone is a device that I didn't make using a service that I don't have. If we want to get into the weeds, it is bullshit that I can't even use radio waves and I must be regulated by the FCC if I want to. But barring that, the companies erected the towers, has use of a satellite, has their CDMA or GMS network, and then does the maintenance for it. When I buy a phone, I'm paying for their services. And they are supposed to provide it as long as I keep the payments up. When money exchanges hands, they have a contract to uphold as well as I do.
No money, no phone.
And from there, I can enjoy a little more freedom than Twitter or these public things. I'm not paying for it, the companies involved don't owe me anything. I am there at their liking. Given that they aren't actually getting anything from me and they formed the company as a business venture, and not an altruistic endeavor, they can cut me off at any time it becomes prudent to them. That's Capitalism.
Banks aren't obliged to provide service, nor are credit / debit card companies. You'll have to go to one of the buildings and pay cash if companies wanted to make it awkward for you. Hell that is if private companies will sell you a handset or repair stuff if it breaks etc.
Because the spirit of it should. The argument of "Well private companies can do what they like" well you now have none of the constitutional rights and the only rights are whatever has been written into law. That means should a private company want to give you a private trial on their premises and do what they want to punish you then they could.Because they are idiots who think the US Constitution applies everywhere.
And when I say everywhere I mean everywhere. Which includes not only outside of the US, and it territories, but also the Internet.