It is crazy to me that any parent of young children would let their kids watch YouTube videos on their own. Maybe this happened gradually enough that some parents didn't notice, but we had our first kid a couple years ago and I nope'd out of YouTube pretty quickly when I saw what was there. Even the channels known for being good - which we occasionally let the kids watch as long as we were present and choosing the videos - started to clearly optimize for engagement over quality, and so now we're done with it entirely. The stuff there for "kids" legitimately horrifies me.