Approximately 13 percent of American adults plan to bet on the NFL this year despite lower enthusiasm from fans in general about the 2020-21 season, according to a new survey from the American Gaming Association (AGA). Of the estimated 33.2 million adults who plan to bet on this NFL season: 20 percent (6.6 million) will wager at physical, legal sportsbooks, up from 18 percent last year. 34 percent (11.3 million) will place a bet through legal and illegal online platforms, up from 29 percent. 18 percent (6 million) will wager with a bookie, either in person or via a mobile…