If something like this was in widespread use it would have much more impact since countries would see whole swathes of the internet immediately go dark when they make stupid laws.
wait... wut? Gun ownership for 12yo's? wtf :D
Though the idea of "internet only for adults" is not that bad IMHO. Yes, internet is (well, at least was advertised as) infinite-resource-of-knowledge but we know how it turned out - IMHO minority of underage use it to spend hours reading wikipedia and instead spend hours glued to crap like tiktok (though crap like that should be banned altogether as well :D)