On the flip side, I let them read whatever they want, including things that are upsetting or that other parents would say aren't appropriate, and I talk to them about what they've read.
Overall, I think these policies have meant more thoughtful media consumption, and more time outside and with friends. I'm not enough of a fool to think our rules are enforced at friends' houses, but we've chosen to live in a community that's largely on the same page.
None of this stuff is easy, but as a parent, it's the job.
The social media companies could have done the socially responsible thing a decade ago and avoided all this.
Don't let your kids have an internet-connected phone, or keep it locked down so they don't have parasitic apps preying on their pre-frontal immaturity until they're old enough to handle it.
All of this needs to be done intentionally, of course, or it will feel like the kids are being punished. But I can't emphasize this enough... it's our job as parents to raise our kids.