You mean ... when I give them access to my identity card (Personalausweis) they have that much more than they already have?
They have my E-Mail, my name, my phone number and payment data.
I couldnt care less with a company that already has so many information about me - I wont give that data to every page or company, but tbh - I got my 20 year badge last year on steam... I can survive that. All relationships have its ups and downs
I know that the new eID in Germany has age verification for online services integrated in some fashion, so I guess it is just a matter of time until it should be possible to verify an account with out giving all the information and it only gets a "this user is an adult".
BUT
the ban on adult games has not really something to do with that - they get banned because of some ppl reporting them.
18+ games are not banned on steam in Germany. You can buy GTA 5, Cyberpunk 2077 and so on. You only get asked for your age without any real verification and then can buy and install it.
That's why I am annoyed by that - if they would ban ALL 18+ games because of that joke of an age verification, the uproar would be massive - but its just targeted at adult media by some christian or BS groups that are fine with killing ppl or as long as no dick is shown that enters any holes (or why is CP2077 ok?

).
So that's why I really want proper age verification, because I do think certain games are not meant to be played under a certain age. If the parents think their kids can handle it - that's fine, all power to you. But a unsupervised child should not be able to play a porn game or GTA, CP2077, Witcher or similar games.