REUTERS illustration/Catherine TaiAmid a U.S. boom in betting online, the European companies behind FanDuel and BetMGM are using features in America that they dropped in Britain after acknowledging them as risks to gamblers.In 2018, British regulators sanctioned the UK arm of online gambling giant Flutter (FLTRF.L) after it failed to catch an astonishing anomaly. The head of an animal shelter had been embezzling money from his employer to fund his bets, losing what the charity said was more than...