https://www.reuters.com/article/us-retail-trading-robinhood-risks-analys/analysis-robinhood-ceos-u-s-lawmaker-grilling-spotlights-brokers-hidden-risks-idUSKBN2AJ16V >Robinhood CEO Vlad Tenev told a congressional hearing that his decision to curb buying in some stocks such as GameStop Corp during a period of extreme volatility was unavoidable, but industry experts said it only underscored the risks the popular trading app was willing to accept to expand its market share.