There’s lots of infrastructure that could help:

• requirements on how children are identified in parental control apps,
• requiring APIs so third party apps can manage parental controls,
• requiring standardized language in UIs so parents know what their kids are in for,
• required messaging for various events - I wanna get a goddamn email instead of a notification on an app I never use
• not requiring parents to use the service their kids are using

Being able to use a third party app to manage everything would be perfect.