Back in January of 2021 when GameStop was all the buzz, trading platform Robinhood disabled the buying of GameStop and many other companies that frequented the WallStreetBets subreddit. This led to dramatic decreases in the stock because the many buyers of those stocks could not purchase them and only sell them. Vlad Tenev of Robinhood and Ken Griffin of Citadel later were at a hearing where their statements contradicted internal communication at Robinhood recently released when it came to the story of why they actually halted purchases on Robinhood's app.