There's tons of weird shit and dark corners of YouTube. Interestingly, what is actively sought-out and removed is anything regarding "hate speech". So basically anything to the right or too national socialist is immediately removed or unlisted. I'm not saying I'm personally for or against it, but it is clear they don't condone that on their platform. However, there is, for example, a mass amount of child grooming videos, things that have Elsa and Spider Man as themes, and when you click on related videos, are about spanking, and cutting off limbs, eating shit, and go into deeper fetish stuff, all aimed at kids who click on the videos if the parents are not monitoring their activity. These videos have views in the millions and are generated by bots every few minutes on tons of channels. These things are fully allowed... unless you'd put a swasitka on it. Then it'd be removed in minutes. They've got very specific agendas over at YouTube.