If something like this was in widespread use it would have much more impact since countries would see whole swathes of the internet immediately go dark when they make stupid laws.
My kids have learned a huge amount from the internet. I have guided them, discussed what are credible resources, the harms possible etc, who they talk to and what they tell them....
There are solutions that would make it easier for parents - people need tools to manage this. Require that children use child safe SIM cards in their phones (they are available already - EE advertisers them). Home internet connections should be by filtered by default that can then be turned off (or off for particular devices in the ISP supplied router that most people have).
I think it’s bad for society to treat adults as children, I’m happy that it should be made obviously available (there’s some merit to the argument that tech-illiterate parents often don’t know devices they give their kids have parental controls at all), but not on by default.
As bad as it is to treat adults as children, it is equally (or worse) to treat children as adults.
Parental control only get you so far. Even if we conjure the perfect tech system to manage this, remember that children were being exploited long before the internet. Bending the internet will not solve the problem, just alleviate the current flavour of child abuse, and force it back offline.