There will probably be a secure 3rd party identity provider that all the sites use eventually. The video sites will only receive a binary yes or no indicating if the user is "authorized."
All of this is beyond sanity though. Porn is not evil. My dad grew up with Hustler, I grew up with The Pirate Bay, and my kids are growing up with 4K Pornhub (after they reached age 12 we disabled the content filters on the home DNS server, also using it as an opportunity to teach how DNS and basic networking functions).
Government (and let's be honest, on this topic it's almost entirely one party in particular) needs to mind its own business. Sex, and things related to sex, are a personal matter. Thinking that I have the right to dictate someone else's personal life in this manner is not something that ever cross my mind, much less thinking it consciousable, much less introducing and voting for it to be the law of the land.
Porn doesn't change you, so that concern can be safely discarded.
It's not evil because there's no harm being inflicted. Adults who consent to have sex and doing it on camera are not engaging in evil. A person consenting to watch the video is not engaging in evil. There are tangential harms such as abuse and exploitation of the actors, but that's not inherent to porn (there is ethically produced porn) nor unique to it (actors in Hollywood are also exploited). The answer to those problems are breaking down existing power structures and zealously protecting worker rights, not banning Pornhub and AMC Theaters.
It absolutely does change you. Seeing people degrade themselves for money has a corrosive effect on your soul, and it's worse when you're getting off on it. It is inherently evil. That there is harm being inflicted is obvious to anyone who hasn't been so desensitized to it that it doesn't register anymore. The willingness of an individual to degrade themselves for money has nothing to do with whether they are being degraded.
Many (most?) actors do not find it degrading. I already addressed the ones that do in my tangential harms comment. There's been plenty of easily googled interviews of both active and retired adult actors and for a numerous amount the work is not only not degrading, but the opposite - empowering. This matches the experience of SWs I know IRL.
I would hazard a guess that the average worker in a large number of low-wage blue collar fields feels that their job is more degrading than the average porn SW.
Regardless of line of work the solution is robust worker's rights protections and social safety nets, so that workers can't be exploited or financially pressured into jobs they find degrading, not to forbid the line of work or portray it as taboo.
If you don't know what you have, you won't know what you've lost. That's what's happening with "sex workers". Maybe some know, but it's too late. Others are just oblivious and that's too bad. To describe what these "performers" do on camera for a lewd, leering audience as empowering is absurd on it's face. Maybe they mean that in the sense of having a kind of power over their enslaved audience. The whole thing is evil.
