As Eacaraxe mentioned, those were the two big sticking points for the credit card companies and a large part of the push for Pornhub to only allow Verified Users. Especially in the wake of Girls Do Porn, which had to pay out a huge sum to the women that drove the case against them (the case itself being that they manipulated and/or coerced the women into participating) and was forced to shut down the company and not work in the adult industry again.
Online porn has been a lawless wasteland for far too long and what we are seeing now is not puritanism winning as much as it is the legal system finally catching up with the development of the internet.
The surface-level issue isn't as remotely as important, in my opinion, as what's going on under the hood. OnlyFans being the smoking gun on this.
Online payment processors are the competition to the major credit card companies. Porn is the economic titan nobody wants to admit exists, and audiovisual media and formatting
follow the porn industry, rather than the inverse. It's ultimately why VHS prevailed over Betamax, and why Blu-Ray prevailed over HD-DVD; I'd even go so far as to posit the accessibility of PPV porn and porn channels on cable played a huge role in the prevalence of cable over satellite in the mid- to late-'90s when satellite television finally became cheap and accessible to homeowners, and probably played a key role in the prevalence of MPEG format over competing media formats during the '00s, downloaded or streaming, because most successful porn sites started streaming and uploading in MPEG.
Being able to control the porn industry is a hell of a lot of power over the entertainment industry at large.
In the meantime, social media-like and creator-driven sites like OF, MV, and certain cam sites are democratizing the industry in a way that's seriously challenging studio- and agent-driven porn -- companies that play ball with the major credit card companies -- and reaching out to payment processors that bypass the major credit card companies near-completely. That's a loss of a
lot of economic control over the industry, and less money ultimately in the hands of the major corporations at play.
Which is ultimately what this is about. One needn't pay close attention to the porn industry to know damn well studios and agents are anything
but clean, let alone after #MeToo when most women who do porn came forward with their own stories of exploitation and abuse at the hands of studio employees and execs, agents, and major talent -- not that anyone really seems to care about
that, apparently. Which is why, within the industry, talent is embracing creator-driven platforms; they're able to work on their own terms, with talent of their choice, free from sexual predation, and at the end of the day make more money doing it.
That's kind of the key point, here: if the goal really is to curtail sexually exploitative and abusive behavior, why start with creator-driven platforms and not the porn studios? Because it's not about that, it's about to whom what money goes, and exercising economic power over an industry that dictates entertainment trends, and the people who work in it.
Which is how and why OF is dodging accountability -- by only accepting 3D Secure payment, they're guaranteeing their payments flow only through major credit card companies; a perfectly satisfactory arrangement for those companies.
That said, bigger surface-level picture: this is only an issue in the first place because sex is still taboo, and sex work is still marginalized and demonized by society at large. That makes it a breeding ground for predatory and abusive behavior, and restricting/prohibiting sex work further whilst consolidating power in the hands of a few highly-corrupt parties will only aggravate that. The only sustainable long-term solution that minimizes harm, is to embrace the industry's democratization, decriminzalize sex work, and normalize sex.
Case in point,
You have a point for sure, but when it comes to child porn, underage teenagers, revenge porn, trafficking victims etc...
The two problems here, that are problems in and of their own right as opposed to being symptomatic, you mentioned are the two dealing with underage people who are unable to consent.
Revenge porn has power, because sex is still taboo, and the people who revenge porn near-exclusively targets -- women -- still face systemic misogyny. Normalize sex and eliminate the societal double standards towards sex and gender, and revenge porn loses its power. Solve for the root cause, not the symptom.
And likewise, sex trafficking happens because it's
profitable. The comparison to illegal drugs and alcohol (during prohibition) is obvious: trafficking happens
because it's illicit, not the other way round. Decriminalizing sex work undermines that profit motive, making forcible or coerced sex trafficking no longer worth the risk or associated cost -- so long as authorities don't treat decriminalization as tantamount to non-enforcement of human trafficking laws, which has been the issue in several states to have decriminalized sex work (especially in regards to those states being used as transit countries to other states in which sex work is still illegal).