While originally running a sportsbook was illegal under federal law except in Nevada, last week (May 15th-ish) the supreme court overturned that law this giving the decision to the states. Twin River (in rhode island) is considering adding it so I would assume if Massachusetts allows sports betting, the Wynn (or encore whatever it is called) will have it. It depends what mass does as a state
Not in Massachusetts
Most likely, I don't see why not. Wynn has to make his money back from the cost of building the casino/hotel. I'm not an expert but I would do that.
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