> I think a part of a better solution is to give parents and children better tools to manage their social graph themselves. Essentially the real problem is discovery and warding off of social outliers in a way that doesnt out all responsibility on opaque algos or corporations.

This is actually a key consideration for the proposed implementation. The biggest issue for parents when restricting their children's online activity is that they simply don't understand the tool available for it.

By having a "child mode" iPhone, parents don't have to know any of that. They simply buy the iPhone Kids for their children and then get a plain iPhone for themselves.

If these restrictions were to actually be enforced by law as well, then it would make it very easy for teachers and other guardians to check if a device is appropriate for the child using it.