The National Football League famously fought against gambling for years, citing concerns about the “integrity of the game.”

In 2015, it shut down a fantasy football convention in Las Vegas headlined by quarterback Tony Romo for its mere whiff of gambling; in 2016, as the other major leagues inked official league partnerships with daily fantasy sports sites DraftKings or FanDuel, the NFL allowed its teams to make team-level deals but did not enter any league-wide deal until 2019.