One could wish the adults/parents would limit this themselves, but sadly this is seldom the case. For some reason it seems most parents really are clueless to the level of harm imposed by social media to their kids?!
In the event there are no countries left there are still options:
1. Hidden services
2. Decentralized
3. Just create a pool mechanism where you contribute your private key for whatever gov Auth system exists, then use a random id from the pool among all sign-ups everytime you sign up for a service.
Child of a rabble-rouser? Arrest that man! Child of a respected judge? Clearly just an honest mistake.
Seems like there's pretty strong revealed preference here (watch what people do not what they say). The people building this tech know it's harmful to kids.
As a parent the argument I hear most often is that all the other kids have it so it's almost impossible to stop your own kids. I don't necessarily buy that, my kids are still young but I intend to keep them away from social media as long as possible.
What is needed, and has been for some time, is an identity service.
This does exist in some parts of the world - here in Portugal, for instance, I access government services online with a smartcard, password and 2FA - and I don’t see why they couldn’t extend this as a general SSO service using oauth or whatever to provide accredited identities to providers who require it due to regulation. The provider doesn’t need to receive anything from the auth apart from a user id, or a “deny access”.
My teen kids aren't on social. I know this because their dumb phones don't support it, and their computers are not permitted in their rooms (Kitchen table only).
I suppose they could get on, through a friends smart-phone, but that would be limited to the time they spend on the bus to/from school.
As a kid I was doing graffiti, and later drinking and smoking weed without my parents knowledge.
2. When would they have the time. They're home, and at school. Band, Judo, Cadets, Tutoring. Where's the time to hide a phone.
3. I'll stipulate that some kids could do it. Vast majority would get caught. And my kids fear the pink bunny suit I have in my closet. I'd walk them to school every day for a month. Lets seem them stay on facebook through that. :)
That 'level of harm' being decided by yourself, I'll wager?