And it's the same reason why everybody keeps pushing the stupidier, most obnoxious and invasive tools to "protect the children".
If you want kids to not access social networks, you need to have most of them out. If only a minority is out, they will just be outcast.
That said, "everybody must do that thing that Apple does" may be a very good example of good regulation. IDK what Apple does, though.
Companies like epic and Microsoft dont. The easy path is just a default install
I suspect this is by design.