A New Yorker article traces how Jontay Porter — brother of N.B.A. star Michael Porter, Jr. — saw a promising career undone by knee injuries, fell into a ruinous gambling addiction that cost him millions, and agreed with a bookie to rig his own stats in a scheme that got him banned from the league. It also follows FanDuel and DraftKings' rise into what it calls the largest expansion of gambling in American history, arguing their V.I.P. programs chase the addicts who lose the most, while Porter, now in therapy, mends his family and bets no more.