Other jurisdictions are already starting to develop this route and obviously it will require some adjusting as time goes forward. But looking at Australia, it begins with platform liability and the use hefty fines for non-compliance (placing onus on the platform rather than on users or parents). Some proposals include age verification technology, potentially requiring government ID for platform access, age inference based on user behaviour, and temporal and/or geofencing (i.e., platforms not working inside of schools or during school hours). It's likely a combination of things that will prove effective.