Not sure what the Gruber thing is about. I guess I lack context. But on ZKP, I will agree but add this:

The only authority that can be trusted to do age verification is the government.

You know, those people who give you birth certificates, passports, SSNs, driver's licenses, etc.

The idea that parental supervision here is sufficient has been shown to be wholly inadequate. I'm sorry but that train has sailed. Age verification is coming. It's just a question of who does it and what form it takes.

Take Youtube, for example. I think it should work like this:

1. If you're not of sufficient age, you simply don't see comments. At all;

2. Minors shouldn't see ads. At all;

3. Videos deemed to have age-restricted content should be visible;

4. If you're not logged in, you're treated as an age-restricted user; and

5. Viewing via a VPN means you need age verification regardless of your country of origin.

It's not perfect. It doesn't have to be.