This is what I was hoping for when I read one of the comments. It's okay if the child can technically bypass the flag. That's what the parent is for, to regularly monitor their child's device. But I am a parent with a technical background so this works for me, selfishly, I have no idea how it will work for everyone else.

But once again, I'd like to bring up my preferred solution for this problem. Ban "smartphone" (precise meaning TBD) for minors in public spaces. My belief is that it will disrupt the dopamine hits enough that it doesn't become addicting and kids don't rely on it completely to function socially. And just having it in legislature will serve as a starting point for parents to discuss the topic more openly, which will help with the network effects. Parents don't have second thoughts on why cigarettes or drugs or alcohol is bad for children, they just are, and whole groups of parents can collectively agree that their children and friends of their children should not be using them. I hope to see the same for "smartphones".