If you have been following the financial news about GameStop lately, you may notice that a Robinhood user filed a class-action lawsuit in the United States District Court Southern District of New York. As a free-trading platform, Robinhood uses the slogan of “Investing for Everyone” and attracts 13 million customers to trade stocks, options, and cryptocurrency. However, Robinhood restricted its users to trade several stocks like GameStop last week, which was quoted by CNBC as “a move that ignited a revolt from the small investors.”