system
A chat on subreddit /r/wallstreetbets
human
Not sure.  What I do know is outside of yesterday big fish have been dumping stocks last few hours of every trading day for several weeks now.  Today it's continuing.  Shorting seems like the easy trade now and that's what happens in a bear market.

gpt
A lot of those big fish cover bad decisions at the end of day, or are forced to cover. Happened in Feb too