Earlier quoted context omitted.
I am from EU, and contrary to age verification laws in general. My stance is that if somebody is a minor, his/her/their parents/tutors/legal guardian are responsible for what they can/cannot do online, and that the mechanism to enforce that is parental control on devices. Having said that, open-source zero-knowledge proofs are infinitely less evil (I refuse to say "better") than commercial cloud-based age monitoring…
"mechanism to enforce that is parental control on devices." Meh, I use it, but it's super annoying and I think that with my Daughter I'll take a different approach (but it will be some years before that is relevant). On Android: The kid can easily go on Snapchat (after approval of install of course, and then you can just see their "friends") before Pokemon Go (just a pain to get working, it keeps presenting some bork…
This is a hobby horse of mine to the point that coworkers probably wish I'd just stfu about Minecraft - but holy shit is it crazy how many different things you need to get right to get kids playing together.
I genuinely have no idea how parents without years of "navigating technical bullshit" experience ever manage to make it happen. Juggling Microsoft accounts, Nintendo accounts, menu-diving through one of 37 different account details pages , Xbox accounts, GamePass subscriptions - it's just fucking crazy!