We took away Youtube Kids access after a few days. It's filled with so much very low quality "spam" content. E.g. random indians with thick accents singing to random recordings of them playing with toys and 5k iterations of that for every single kids song imaginable. And that's even excluding the potential of them finding content along the lines of "Elsa Gate".

Youtube-dl is your friend. Download (or pirate) quality content for them to consume offline. Disney streaming is also a no-go these days, not going to touch that with a 10-foot pole.