After YouTube implemented the DMCA takedown system, they also pretty much automated their reporting system.
It was known that YouTube were blatantly lying when they claimed that a human being reviewed all of the videos flagged for ToS violations.
Emmy award winning journalist Mark Bunker for example has his channel XenuTV attacked by Scientology, and taken down until mass protesting by the community.
I was also a victim of this, when I had my first channel taken down for hate speech.