Less than six years after a Supreme Court ruling paved the way for legal sports gambling, U.S. sports leagues are facing an onslaught of betting scandals. The latest example is Jontay Porter, a little-known NBA player, who has been given a lifetime ban for betting on games. WSJ’s Jared Diamond unpacks how major leagues are confronting the darker sides of sports betting with alarming frequency. Further Reading: -NBA Player Banned for Life for Betting on Games  -America Made a Huge Bet on Sports Gambling. The Backlash Is Here.  Further Listening: -How a Psychiatrist Lost $400,000 on Gambling Apps  -Disney Gets Into Gambling  ​​-FanDuel CEO on Sports Gambling's Big Boom  Learn more about your ad choices. Visit megaphone.fm/adchoices