I agree that there are issues, but won't kids find other places to congregate? Maybe in educational sites?

Isn't that better? For one, they're connected to peers they have physically met. Additionally, they won't be exposed to strangers or ads that warp their world view.

I still believe that the government should ban unsolicited algorithmic content (so search engines are exempted), but this is a second best option.

Perhaps using anonymous registration-free platforms like Session

Yes. Hopefully outside, in the park playing with a ball or running around.