Start out with fines for the big players, then whack-a-mole on the long-tail, or anything that becomes big. At some point they'll try and automate it all with AI, but that will probs be a few years away.
https://www.npr.org/2024/11/07/nx-s1-5182775/australia-social-media-ban-children
Here's a great way to keep kids safe: Force them to use the dark web. Oh, wait
Strange language isnt it? The web that spies on you is NOT called the "dark" web. The regular unspied upon web is called "dark". I recommend listening to Snowden's talks. He argues convincingly that they will remove privacy from the biggest parts of the web, or add KYC. And everything else will just be marked as suspicious. They'll come after that whether you've done something wrong or not.
The more bloated by bureaucracy the legacy web becomes, the more the free web will outcompete.