system
A chat on subreddit /r/wallstreetbets
human
A huge amount of the daily traded volume is made up of high-volume traders which is basically computers that execute trades and hold stocks for seconds (or less) before selling them. When the market is trading outside the norm most of these are designed to stop trading. As a result, the trade volume is way lower than it usually is. Market makers are still buying, they just aren't enough to prop up prices because they don't make up most of the volume traded daily anyway.

gpt
That suddenly makes a lot of sense! Only invest when you get a trend you can predict.