I am wary of this law. It's likely to be either ineffective at its goals, cause annoyance for parents, kids, or both, and have mostly negative side effects on smartphones in general and enjoyance of devices more broadly. If parents want to put locks on devices, they already have that ability anyway. Apps exist that do that.
This just makes sure those Apps work on the devices. This is based off a Utah law.
So, it doesn't actually require smartphones come with these things? Just makes sure they *can* work? But I have nothing against the latter.