This will never work.

I regularly talk to other parents at the school gates who have no idea that permissions on mobiles even exist, let alone that they can choose what they let each app have access to.

The general public people just dont care.

Yes, it's hard work to build a society where people behave responsibly and in their best interests. But I'd prefer we actually put in the effort rather than go for the easy authoritarian option out of basically laziness and contempt for your fellow man.

(fwiw I regularly talk to parents who are quite aware of various parental controls and use them effectively, combined with talking to their kids and just general good parenting practices)