Exactly my thoughts too. On the other hand some parents are neglectful and let their kids waste their childhoods on phones so this could benefit a lot of them but ultimately this is not the job of government.
Discussion
Unfortunately, most parents I know will not take the time to learn the apps their kids want to use, or they simply turn a blind eye. It takes one kid in the friend group to get the app before the rest start begging for it too because they don't want to be left out.