You're even taking it far, bro, they do not need to visit an ATM anymore if they are gambling at physical casinos as the facilities are already made available. Except the gambler is living in a very underdeveloped country, there will always be an electronic means to gamble as an alternative to cash. Cash these days is even risky, especially if your country's money is so undervalued to the point that $20 worth would be as if you had the whole world's money in your pocket.