It's ridiculously hard to restrict all of the harmful content. And frankly, the big tech is less trustworthy by the minute.
I think by having adult devices parents will be more cautious and mindful of what they are granting to their kids.
LLMs could change all this - it's possible to quickly do pretty impressive analysis of the content of videos, games, and so forth.
I hope username checks out.
Leaving parenting duties to the overall average of the internet bound together by corporate scammers is not something I will ever do.