If you let young kids browse youtube by their own you already failed as a parent, there really is so much shit there like peppa the pig murdering people etc they will inevitably ending up on due to the algorithms.
I actually think that the algorithms in kids YouTube do pretty well.
I’ve watched a mad amount of that with my kid and never saw anything unintended. There might be some marginal YouTube celebrity type Minecraft videos mostly where the dues are being purses but not really violent are inappropriate.
It seems to me the most obvious fix though, is for YouTube to lock the kids content to specific creators and channels that have higher scrutiny, preapproval of videos, or videos that only get loaded onto the kids side after a certain number of views. I guarantee all the inappropriate shit is going to be on low follower count channels or clearly labeled for adults.