This describes the exact purpose of the law: to stop letting kids use those sites.
My very strict uncle was adamant that my cousins stay off Facebook when they were kids. They got on anyway. When he eventually found out, it was a bad situation. If he couldn't stop his kids from getting on, only the websites themselves can.
> My very strict uncle was adamant ... When he eventually found out, it was a bad situation.
These might be related. Of course kids will respond that way to severe strictness - it tends to happen with anything a parent acts that way about, whether it's social media, smoking, or simply hanging out with a particular group of people.
This is, still, the fault of the parent.