When it comes to regrets, Michael Burry has a few. The investor of "The Big Short" fame, who bet on GameStop years before it became a meme, explained why he sold the stock before it skyrocketed in a Substack post on Monday night.Burry got in earlyBurry, who recently pivoted from hedge fund manager to online writer, first invested in GameStop in the summer of 2018. The video-game retailer's stock looked undervalued to him, and he saw an array of catalysts that could send it higher, he wrote. They included ...