Robinhood gained millions of users during the GameStop craze. But many have left as interest rates have gone up. CEO Vlad Tenev is now focused on growing Robinhood into more than just a trading app. Along with expansion into retirement accounts and credit cards, Tenev discusses Robinhood’s 24-hour stock trading. WSJ sat down with the Robinhood CEO at the company’s headquarters to hear how he hopes to make his business the most trusted name in finance.