> Sure enforcement would be spotty and loose, but tickets for parents and fines for tech companies would go a long way to establish the cultural change without the need for "verification"

A company can't work like that - the tech company will need to do it's upmost to avoid the fines, and so will implement verification that is both unsafe, incredibly invasive, discriminatory but crucially has an audit trail, and it's insane to suggest they would do anything else.