[toomuchtodo]

Plex, Jellyfin, and similar solutions where you rip content for your own media collection and serve in a constrained manner can solve for this. App gets installed on kid's device, and you use the cli or use the web interface to push it into the storage system it's streamed from.

(i do this, it is very straightforward and keeps my kids off of Youtube)

[Dramatize]

I've been thinking of doing something like that with a Synology

[toomuchtodo]

https://news.ycombinator.com/item?id=36378689 might be useful

[whazor]

Though the UI/iPad app of Plex is buggy and difficult too use. I haven't tried Jellyfin enough yet though.