That's Facebook. Just because it's mandatory doesn't mean people aren't going to cheat it. And cheating is the problem. Verifying that it's an actual human sitting at the keyboard is basically an exam proctoring level problem. Otherwise people will just produce vast farms of accounts.

AI of course makes it easier to fake whatever kind of evidence the verifier is asking for: there will be an arms race between fake AI and verification AI.

(the nearest to verified membership I've actually seen in practice was, oddly, Debian developers - you had to get a key signed in person to be in the club)