The state law gives Maine's four tribes exclusive rights to online sports betting. It also allows sports betting at Maine's two casinos and soon to be five off-track betting sites.
Since the law went into effect, Maine's Gambling Control Unit has been working on the final rules before wagering could go live
Source https://wgme.com/news/local/legal-sports-betting-expected-go-live-maine-november-2023-gambling-control-unit-governor-janet-mills-casinos-online-native-american-tribes