You ignored three of my points:
1. These platforms are highly addictive, and designed to be highly addictive. Just because these are digital services doesn't mean they can't and shouldn't be regulated like, say, addictive substances.
2. Many parents are themselves addicted and don't understand the harms or choose to ignore them. There are numerous areas where society decides that regulation is appropriate because a product or service is so detrimental and/or being offered predatorily.
3. Even children who don't use social media can be harmed by these platforms. Very few people want to acknowledge that these platforms are being abused in ways that allow users to cause immense harm to non-users.
> It's also a much less restrictive option than forcing EVERYONE to give up their privacy.
You already have no privacy online and these social platforms are among the biggest privacy violators. Why do so many people pretend this isn't the case?
Facebook, for instance, has "shadow profiles" of non-users created based on the collection of data from tracking tools (like Meta Pixel) that the vast majority of people don't even know exist. If you're pro-privacy, would you support laws that ban companies from doing this?