It gets weirder when you have the live action stuff with kids' favourite characters murdering and raping each other. Somebody put in actual effort to put some of that stuff together. Other animated pieces are just a bad accident.

It seems kind of circular. Somebody writes an algorithm to try and take advantage of kids' love for popular cartoons. It grabs keywords, phrases, characters, tones, sound clips, etc. It puts them together into a short (or too long) animated video. The YouTube algorithms pick up on some common tropes and then those autofab end up in kids' watching queues, they end up getting enough views because they keep kids numbly watching (not knowing what it is their taking in), other groups start noticing and decide exploit the algorithms in the same way. At least that's how it appears to me...

There’s a very distinct internet marketing subculture, and for some reason it’s always had a lot of cross over with script kiddies and semi technical Wordpress marketers.