The difference is that those other things in the past didn't really place an undue burden on everybody else. Whether a child is allowed to watch an R rated movie or go to a pub has no effect on how I conduct myself, age-gating computers or the internet does affect how I use things.

> I think the theory behind the law is that experimenting on children to optimize (without any ceiling) for increasing watch hours, which 100% of the social media sites are doing at all times and have been for over a decade, is unethical and should be illegal.

I agree, and I think this is where the focus should be. It places no burden on any regular consumer to do anything and all the burden on the platform providers.