Photo-Illustration: Intelligencer; Photos: Getty Insider trading used to be the domain of mergers and acquisitions lawyers, bankers in contrast collars, and Martha Stewart — people with influence using tips from their station in life to win while people on the outside lost. But the game has been opened up for millions of Americans, democratized by prediction markets like Kalshi and Polymarket, where users can bet on anything, including, in some cases, an outcome they know is going to happen. Or