Why is it so important that kids have access to the internet anyway that we're willing to sacrifice both our privacy and freedom of speech rights for it when we already know it's damaging their mental health?

We don't need all this privacy invasion if we just didn't give kids a smartphone with a data plan.

School basically requires them to have one. So.

On school computers maybe, but not on their smartphones. If schools actually require kids to have their own computer with internet then that's quite simple to fix by enacting new rules. That's important for access to education as well for kids from low-income families.