Topline Bets on sports betting giants came up short Tuesday, as shares of gambling market dominators DraftKings and FanDuel tanked as Illinois closed in on a significant increase on the tax rate facing the companies' operations in the state. Tuesday was an icy day for DraftKings investors. Getty Images Key Facts DraftKings stock nosedived 11% and U.S.-listed shares of FanDuel parent Flutter Entertainment tanked 7% in Tuesday trading, moving against the tech-heavy Nasdaq stock index's modest gain. The stock ...