Also children can "come upon" devices, so this is still completely pointless unless there's a way to ban devices that don't have this ability. and the only way to do that is to ban devices that cannot verify the user's age. since a device can't really verify an ID, some third party (ideally meta, but also the government works) needs to verify id and age, write something to the secure enclave of the device, and now that's stuck with the verified age set.
If "just let someone report the age" worked, pornhub wouldn't be blocked in TX.