Although actually, huh. Maybe it's a little more organized and is just a general memetic malware scam; con youtube's algorithms into putting your junk which was generated in 0.4 seconds onto a few million screens and pocket the ad revenue.
The point is, it might not be any more malicious than anything else that advertisers do on a daily basis, if they were just auto-tweaking the videos to optimize for revenue and hey, presto, colorful crap topped the list. After all, it's just an impartial algorithm.
Kinda makes you think about all the other stuff we happily let advertisers get away with, huh?