In the past couple of years there has been a huge uptick in YT content targeting very young children. The feedback loop is so tight that many of the creators have converged on designing some of the most visceral (and disturbing) material that appeals to kids at a reptilian level. Think about how genuinely weird little kids are. Sometimes they do stuff that would be scary if it wasn't just a minute of innocent pretend…
I'm not sure what kind of parent would let their kids watch stuff like this but it's pretty shocking to see that this stuff is even marketed as "for children". The only "for children" things I've seen on Youtube are pretty innocent animated shorts (lots of nursery rhymes too). But I guess the algorithm will show you what it thinks you like.