DraftKings and rival FanDuel spent gazillions on TV, radio, digital, billboards and every other kind of out-of-home except maybe for urinal sanitizers. Maybe that should have been earmarked for legal. “Just by the crazed amount of tonnage that [companies] are running — this is expensive advertising … they’ve piqued everybody’s interest,” said Tobe Berkovitz, a Boston University professor of advertising.