By Dan Weil Sunday’s Super Bowl LVI isn’t just the big game for football and advertising. It’s also the big game for gambling. Sunday’s Super Bowl LVI isn’t just the big game for football and advertising. It’s also the big game for gambling. Legal betting on the NFL title game, including online gambling and retail sportsbooks, could total $1 billion in the U.S., estimates PlayUSA a gambling information firm. That would about double last year’s total of more than $500 million. “$1 billion in legal wagering on a single game would be an impressive milestone for the industry,” said Dustin Gouker, …