This week Robinhood announced that it will no longer display how many customers hold a certain stock on it's website. They will also restrict access to their API. This move would affect third party sites, like recently popular, RobinTrack.net , that display the number of people buying and selling securities. Recent reports suggest retail traders have been using the information to jump in and out of stocks as the zero fee brokerage has helped increase the popularity of day trading in retail markets.
In a statement from Robinhood, CNBC reported, "Even though we're restricting third party access to our API, our customers will still be able to take advantage of the many other tools and resources we offer..."