Ron DeSantis with the Seminole Tribe of Florida said the tribe could offer online sports betting across the state. In 2021, a $500 million deal negotiated by Gov. “It’s an existential threat to our community,” said Dan Gelber, the mayor of Miami Beach until last month and a longtime anti-gaming advocate. The proposal set off alarm bells for gaming opponents who have sought to block the introduction of gambling to new areas of South Florida, including by opposing a casino at the Fontainebleau Hotel and Resort in Miami Beach.