They do not. Laws governing alcohol do not cover gambling. (And even so, alcoholics have no problem getting regular drinks at their bars of choice, anyway, with few - if any - legal issues.)

Problem gamblers must self-exclude and the casinos then must do their best to adhere to these lists that the Nevada Gaming Commission sends out. (And casinos are very good, if not infallible, at doing this.) But the person must exclude his/herself.