Grayjay dev here, this is for sure a use case we have in mind. The idea is in the future to allow you to share subscription groups you've made for your kids with friends.

Maybe there can be a website where people share subscription groups with each other in general. Good archery channels, good fitness channel, kid safe channels, etc.

Another thing I am pondering is if it is worth adding a mode that prevents your kids from accessing other content then what is in a specific subscription group.