What if Google, Apple, and Microsoft had "kid mode" versions of their OS which is what is enabled by default for any under 18 buying a device and normal mode ha

What if Google, Apple, and Microsoft had "kid mode" versions of their OS which is what is enabled by default for any under 18 buying a device and normal mode had to be enabled at point of sale with ID verification? In kid mode, it could only go to kid sites and run kid apps. If a parent ignores all proper advice and enables normal mode on their kids device, then that's on them (or lock them up, idk). The main advantage is that the id check only has to happen once, in person, and it leaves most of the responsibilities on the parent who should have a vested interest in raising their kid rather than a corporation who wouldn't.