Kids shred these schemes. The designers of them seem to forget that the social dynamics of the adult world are completely different - just one kid needs to figure out how to bypass the system, and the knowledge spreads like wildfire.
Example: schools banned phones, so kids switched to talking over Google docs:
https://www.theatlantic.com/technology/archive/2019/03/hotte...
If we give parents better tools to limit and monitor internet access, kids will just buy a used phone which is unregulated. If their parents even bother to use the tools in the first place (it is my impression most parents do not). There is also a lot of loopholes parents do not even think of (like a web browser on a game console).
When I was in high school we all learned about proxies and bypassed the school firewalls. You didn't have to know anything technical after a few people figured it out. Hell, even the teachers were in on it. I remember one wanted to know so he could check the lotto numbers lol.
It's an eternal cat and mouse game and the mouse is going to win. I agree that the right idea is friction but if people aren't aware that there's no clear win that's going you work even 80% of the time then we'll write the wrong laws and have the wrong idea
having kids fiddle around with alternative means and schemes of communication might well turn out to be an intellectual and academic net positive.