> with enough cryptography we could get a way this would work
No amount of cryptography will stop a parent from handing a verified device to a child. Parental controls (however effective you think they might be) have come enabled by default in the UK for the last decade and literally need to be turned off - which is exactly what will continue to happen.
No amount of cryptography will stop a parent from handing a verified device to a child. Parental controls (however effective you think they might be) have come enabled by default in the UK for the last decade and literally need to be turned off - which is exactly what will continue to happen.