Obviously this is because 77% of all pornhub viewers were underage, and NOT because privacy-infringing age checks create a deterrent effect that reduces all pornography consumption, which totally was NOT the goal all along by the puritanical fundamentalist religious groups backing this expansion of warrantless state surveillance.
It was definitely to protect the kids and NOT to try to quash all depictions of human sexuality due to a fetish for appeasing the arbitrary whims of the invisible sky daddy, as told to us by the people who pinky promise they were speaking on behalf of invisible sky daddy.