And make sure you do it at their friend’s houses too, and on every public device, and make sure they never leave that locked down app bubble ever.

and delete the web browser?

Computers (they each had their own) in public space and no phone until 14. Worked great w/o no filtering or whitelisting of any sort.

there are similar mechanisms for controlling website usage. school computers do it all the time

ballpark percentage of parents that are technically savvy to set this up? I'd put that at 0.0284%