To be clear, I don't agree with these laws and think they are very much the wrong way to try to solve the problem.
But it is not a solved problem. From what I've seen parental control software is generally pretty terrible. But this age verification stuff isn't really helpful.
there is an exceptionally simple solve to the problem: Do not give your kids access to a cell phone or tablet.
It's a solved problem with a slightly flawed implementation on the end devices.
You seem to be arguing that introducing the whole new class of legal frameworks, technical requirements and privacy scandals(1)(2) is somewhat better than fixing the end user software flaws.
(1) https://www.msn.com/en-us/money/other/1-billion-identity-rec... (2) https://proton.me/blog/discord-age-verfication-breach