Here's a good explanation by Matt Levine: https://www.bloomberg.com/opinion/articles/2021-01-29/reddit-traders-on-robinhood-are-on-both-sides-of-gamestop?sref=1

Here's a good explanation by Matt Levine: https://www.bloomberg.com/opinion/articles/2021-01-29/reddit-traders-on-robinhood-are-on-both-sides-of-gamestop?sref=1kJVNqnU https://www.bloomberg.com/opinion/articles/2021-01-29/reddit... under "Why did Robinhood stop them?"