I have friends/ colleagues who have school-age kids. Most of them monitor their kids' online activities. Some don't, due to general busy-ness and the phone/ computer/ TV becomes the babysitter. It's up to them. (my opinion - screen time use should be monitored, esp if very young)
There's also the danger of child predators/ pedophiles/ grooming on these sites (FB, Tiktok, etc).
The U.S. is investigating TikTok for being a haven for child predators
There are also health issues (physical, emotional, mental, developmental) regarding too much use of mobile phones or computers.
Health Risks of Using Mobile Phones
+++++
I think David48's way of letting his kids have more physical activities/ sports is a good thing, especially nowadays that kids are exposed to so much internet/ social media.