When my kids were small, I was fighting with crazy Youtube videos. Kids started with something innocent and soon were watching sick and disturbing pieces.
Giant plastic spiders chasing kids. Momo. Kids behaving silly in front of camera and playing silly games. Kids with masks of superheroes. Something about SCP.
This was (is) Elsa-gate. It was a whole big thing.
Honestly they looked like cartoon shorts that belong on adultswim or something. It's hilarious that they were unironically being watched by kids, but also not.
So I built an app to control their Youtube consumption, which later turned to a cool small business https://itunes.apple.com/app/id1431645198