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).
Who do you want your kids to communicate with over the internet ?
I’m surprised by all of the comments assuming the internet can’t possibly have any value for kids in any way, shape, or form. Did HN commenters grow up and forget what it’s like to be a kid with friends? With an interest in games or technology or discovery?
Oh, and a good chunk of abuse happens by friends & family, not strangers.
Before that, porn was printed on paper magazines and, not surprisingly, sought out by and distributed among curious teenagers.