“Can y’all hear me right now?” Keith Gill began his broadcast. “I kinda forget how to do this.” Back in 2021, the influencer better known as Roaring Kitty led a crusade by retail traders which triggered the extraordinary surge in GameStop, an embattled video games chain – and left Wall Street scrambling. Gill became an internet star, and even testified to Congress about his bullish stance on the stock. Then he disappeared from view. For years after the turbulent stock market frenzy, Gill was silent online. ...