just sell an online gambling license to these companies. you could name a high ass price if you wanted. make it an annual thing.
we cant tax gambling and its going to happen anyways. why not make some money. you sell a license for xxxx dollars and say anyone who buys can operate legally in the united states.
Vegas Baby!... unfortunately some of the big vegas people control or have a massive influence on the govt so somethings things can get very very blurry