The type suburb we build today are one of reasons. At least it enforces that behavior in parents.

Then there is also “no screen time” so the kid will not learn how to behave online, not able to detect scammers, understand things like privacy and trust, etc.

And there are also laws: you might get in trouble if you leave your 15 year old alone overnight. And when 17 not more than 2 nights. But they can join army at 18.