like, the most extreme form of this I could imagine would be "you need to obtain a certificate/license of successful training in Internet and perhaps pay a regular fee to be able to access most/all of the internet, otherwise you only get a very narrowed-down version (even if you could reach the servers, the servers would also be forced by law by default to deny you access w/o the cert".
That's not technically impossible to implement.
In fact, it would be way easier to implement than the "ban social media for kids+teenagers" stuff considered currently.
You just need to either get buy-in or force social media providers, VPN providers and ISPs to implement that.
Sure, it would massively restrict access for most people. But what if you just would have to buy a device in a store to get access to a VPN to view "adult content", and you need to show an ID to buy it. (similarly, make SIM cards age-gated; they often already require ID).
It's easy (both in implementation and policy, and easily enforceable after a grace period), devastating in impact, and most critique of age-gating or whatever curr. considered wouldn't apply.
What I'm actually wanting to say:
Now is the time for overlay networks and a total splintering of the Internet as we know it.
Net neutrality discussions of the past will feel tame and mild compared to what's about to come.
actually, if the weird bans itself can't be prevented, this approach would be imo one of the best possible implementations.
Maybe I'm a bit biased. Germans love their overlay networks. Just look at Gematik, DN42, etc. (this is perhaps the most hilarious list I've ever made)