Wow, sheesh. That's terrifying, but it makes a whole lot more sense than my pet theory, was that the videos were screening tools for state actors. They would seed YouTube with videos of beloved characters undergoing suffering and violence, and then use analytics to determine who kept watching. The kids who got squicked out would be collateral damage, but the ones who kept watching would be identified as potentially useful psychopaths, and approached to be recruited into black-ops assassination programs from an early age.
To be honest I'm not sure what's worse -- that or the child molester angle.
That subreddit seems more heavily focussed on 'bible code' style inference of hidden messages and conspiracies than the actual market forces driving these videos, and hence ignoring the real problem, youtubes perverse incentive structure.
In a world with private key encryption, sending a message on a weird video on youtube via antiquated cyphers seems less plausible than bot generated comments from a lexicon that increase a videos profitability.
If I was to infer a conspiracy, it would be that the some people are putting easily deciphered insidious messages on the videos purely for their own entertainment. The videos themselves are a simple cash grab, some of which are very weird and those are the ones we end up discussing.