Why do you see it as unsafe if a caretaker fully manages what content is viewable? For example, like this: https://abparenting.substack.com/p/effective-youtube-kids

People repost high quality stuff, but add 5-10 sec of incredibly traumatizing content in the middle.

This write up sounds very interesting, until you go any try to set things up, and find you're forced to approve something from a predetermined list pushed by YouTube. No thanks. I'll download videos and play them with VLC locally.