Earlier quoted context omitted.
What content are you thinking of that is banned for under 18? Idk if I can think of anything besides porn.
Many businesses in the US check ID at the door. If you are underage, they don't let you in. On the surface it seems reasonable to ask for an equivalent ID check online. But. The bouncer doesn't photocopy my ID and store it in a poorly secured back room that is regularly raided by criminal enterprises or outright sold by unscrupulous owners of the establishment. Similarly, they don't check in with the government in a…
It simply means that it has not arrived in your vicinity yet. In Sydney (Australia, not Canada), whilst most venues are satisfied with quick visual checks of one's face / ID for anyone who looks young, some venues have equipped the bouncers with iPads that run an app dedicated to taking one's face picture and recording the government issued ID details (driver licence number, residential address and particulars – all of them! or no entry). I have had an argument with them a couple of times where the bouncers refused to say – and pretty aggressiveley so – how the PII is handled, who will own it after handing it over, and how to delete it. I simply walked away each and every time, and I no longer approach the venues that record the ID details.
Frankly, the erosion of privacy in western countries is reaching epic proportions, with incumbent governments making substantial efforts to get into one's colon against the citizen's wish.