There will always be ways to cheat the system, that doesn't mean there should not be a system. They have a pretty agressive detection thing as well, to the point of one page that i follow having to contact support bc it was detecting a dildo as a real person.
People that are going to collab in porn usually do it multiple times, this idea that someone is just going to make one video ever is BS. If the person is done with the whole thing, they can just delete their account and that account can't be used as verification anymore, as far as i know.
Sacrifice your privacy is a strech, OF is not a social media, people do it to make money , they kind of have to know your ID to be able to pay you, like most jobs. The site is massive as well, have millions of users around the world, nobody is going to leak some random person ID in there, and even if there is a leak, there is so many people there that it would not matter, unless someone rly wanted to fuck with that person.