Look, there is no way the government will be able to keep up with which websites or platforms are the most risky for minors. The curious ones will look for ways around the system and end up on those non-mainstream sites. The predators will look for ways around the system too. It is much better if the responsibility is taken by the parents. And I highly doubt the government would stop at only checking the age. There would soon be special licenses for special websites. Imagine the eightteen year olds lining up at the local townhall to apply for a license to watch porn. Or, less comically, unless you are vaccine verified you cannot access any websites except the government healthcare one. Enforced at the ISP level, for your own protection.