https://www.reuters.com/article/us-retail-trading-apps-investment/gamestop-frenzy-sparks-fresh-investment-in-stock-trading-apps-idUSKBN2AI2IE >The recent trading frenzy centered on GameStop Corp and other “meme” stocks is sparking a wave of investor interest in start-ups aiming to mimic the success of Robinhood Markets Inc, whose no-fee brokerage app has helped drive a trading boom.