In the same way parents can be blamed for not keeping their children safe around guns/alcohol/drugs, they should also be blamed for not keeping the children out of digital dangers, and keep mandatory age verifications out of here.
The premise that parenting is wholly on the parents and society at large doesn't need to play any role in raising kids is a manifestation of the kind of libertarianism that appeals to techies on the spectrum who want to find the simplest possible ruleset for everything, but it just doesn't work that way in reality.