This kind of wild speculation is not encouraged over here, and most people don't want garbage in the comments that they have to sift through, so "just ignore it" is not a valid defense. See the comment section of the guidelines: https://news.ycombinator.com/newsguidelines.html

> Literally the same people are left with the bag after each bubble

People who buy stocks based on hype, feed bull runs, and proceed to hold and try to time the market, "coincidentally" are usually left holding their bags. That in no way implies any kind of rigging beyond the basic dynamics of the stock market.