Otherwise, I think my perspective here is very similar. I'd personally emphasise legal publisher responsibility, a repeal of Section 230 in American.
By absolving social media platforms of legal responsibility for the content they publish, we've allowed some very unpleasant scenes to flourish in the most mainstream of places.
Well with you on the issues of addictive design. I'd throw in data harvesting, sketchy advertising, and increasingly platform- level political bias.
Age restrictions simply increase the age at which users are exposed to harms, rather than addressing those harms themselves.
These platforms have become staggeringly wealthy and powerful, it is them what needs to be controlled, not kids.