I think getting the age thing correct is key to get parental classification to work properly(I think now platforms just ask for a birth date which is lame) e.g

> Surveys by Britain’s tech regulator, Ofcom, find that among children aged 10-12, over half use Snapchat, more than 60% TikTok and more than 70% WhatsApp. All three apps have a notional minimum age of 13: https://archive.ph/y3pQO

Once you get the classification correct — and AI cannot it do this — only via community ombudsman/age verifiers, in a privacy first way*, the app stores can easily tell the app devs what accounts are sensitive and filtering should be much more effective.

*Basically once your age is verified by a real human for your device(using device local encryption to verify biometrics) you are set. No kid should be able to bypass and install apps it on devices that their parents hand to them. There will always be black market devices with these apps, but there are ways of beating those to be very minimal by existing tech.