According to this wikipedia article it is mandated for pornography in Germany and the UK. Interestingly enough some alcohol companies in the US also try to verify their users age to ship them alcohol... So yeah a pretty isolated problem I guess

That is not necessary for age verification. You just have to go through a working verification process and then you just get the checkmark in the database. most sites that really verify your age use credit cards for that, which are of course sub par, because children can just take the cards from their parents, but it is better than nothing

And this process does not necessarily have to use ypu personal ID

Nope I meant real verification. Pornhub doesn't require it, because the server and the company are not stated in Germany. Imo all porn site should have real verification instead of the "I am 18 or older" popup, that literally does nothing to prevemt minors from seeing porn.