You vastly underestimate the current state of surveillance capitalism.

> You could also look at who is heavily lobbying for this, you'll find it is fascist tech oligarchs from the US.

Go in the street, and ask a bunch of random people: "If there was a way to prevent kids from accessing stuff that is bad for them, and it had no downsides. Would you want it?". I'm absolutely certain that not only fascists will say they would want it.