Basically there's a huge market of YouTube channels that make videos aimed at children, and through a process of algorithmization this has spiralled into a maze of procedurally-generated content that doesn't make any sense and is incredibly disturbing. Things like knockoff Peppa the Pig vids that suddenly drift off into Peppa being degraded or injured, and comment sections all had comments in some form of code language, seemingly gibberish, but when decoded lead to child pornography websites and degradation porn. No conspiracy (or lunacy) theory stuff here, trust me, it really did lead to horrible websites. It's difficult so I will just link 2 pieces, the NYT one and the Medium piece. The Medium article is fascinating. Whether or not you think the author is hyping it all a little too much you can't say he's not thinking through how all of it works. Also the producers of this stuff are untraceable and no one quite knows how it became... this. I mean... I don't play with demons.