Noble goal but it ends up being a defacto internet license. All ages need to show id to use sites and services.
No website of any kind should require IDV unless banking. It is a tool that will be used for censorship, removal of access to information, destruction of freedom of speech, erosion of privacy, and attacks on political opponents.
We need anonymity, ephemerality, and public square free speech.
Governments should instead regulate what these companies can do. How they advertise. Engagement algorithms. Stop internal efforts to target kids. Etc.
Disallow advertising to kids. Turn off ads on children's accounts if the user is predicted or self reports as a kid. Turn off the algorithm for kids.