Earlier quoted context omitted.
you can accomplish a whole lot of the same keeping the phone and deleting all social media apps and accounts (what I did). I still use my phone as a map and camera and many other things … my screentime went from 7+ hours to hardly ever over 40 minutes daily
I keep coming back to the sites on my phone's browser. I have tried using various firewall applications to block network traffic. But it's hilariously easy to get around them.
Something similar should exist for Android with regard to parental controls. Though for Android, I suppose you could also just uninstall/disable both the browser and the Play Store through adb.