I wasn’t trying to be short or condescending either. Just relaying what I know.
It is another layer of privacy in some cases. Could protect against poisoning of I’m not mistaken, but don’t quote me.
I know for me, I prefer to self host things where I can so I can own as much of my own data as possible.
Technology is going to be a part of every kids future (if they have one…) and should be taught with the other things they need to learn to be functional and successful.
There are other ways to limit social media access, and wccessnto other unproductive media. Use school sanctioned devices for work. Hire proper IT folk to lock down the equipment. But that would require funding for schools to be adequate.
This is a complex issue. You are over simplifying it.