You're moving the goalposts. I was responding to your claim that any verification system involves the government getting a complete record of all online activity.

If you're willing to admit this is entirely possible from a technical standpoint, there's a separate question about how useful/valuable it is.

Making it harder for children to access extreme pornographic or violent content seems useful to me. Many advertisers want to be able to say they've shown ads to a human not a bot. Humans in WEIRD* countries have more valuable eyeballs than humans in the developing world.

If you don't solve for those use-cases in a privacy preserving way, adtech will do it in an intrusive way - which is what Google are doing in the OP.

*"Western, Educated, Industrialized, Rich, and Democratic"