Earlier quoted context omitted.
Yes, yes, and yes. However, the three situations you named are targeting adults. Children and teenagers are worth insulating from the full might of advertisers, propagandists, and always-on virtual social circles.
I would argue that it is the responsibility of parents to decide how to do that. But if you want a legislative solution, there already is one (COPPA) which prevents people under the age of 13 from joining social media. If you think those legal protections aren’t fit for purpose (they were created long before social media even existed), then you should take that up with your legislators. I personally wouldn’t trust th…
Nothing (besides parents) can prevent people under the age of 13 from joining social media. The kids just lie about their age. Everyone knows how to lie about their age to get something they want, from the time they're in kindergarten.