Re: Age check = ID
The one sensible idea in this whole mess is having a third-party do the actual identity validation completely independently from anything else. They are then able to provide some sort of verification token to any site that asks for it, presumably based on some sort of username/password you provide,
Yep, but providing uid/pw to a second or third party also reveals your identity to that party.
The possible promise of said third party to immediatly forget your identity after the queston does not count.