Phones have had parental controls already built in forever. My sister is a busy executive who commutes daily and she didn't let her kid have a phone until age 13, and when they bought an Android phone they signed up for one of the (many) existing parental monitoring apps. Which for ex will notify the parent when their child gets messaged from a new person not in their existing curated contact list. So their phone is only used contacting their close friends at school. Parental monitoring and controlling usage on sites like Youtube and Facebook is a long solved problem, if the parent put any basic effort in.

> Phones have had parental controls already built in forever.

Most of them don't work as advertised.

> Parental monitoring and controlling usage on sites like Youtube and Facebook is a long solved problem, if the parent put any basic effort in.

How old are your kids?