There are plenty of circumstances in which you will have to show your ID to someone in your daily life. Whether it be going into a bar, purchasing alcohol, in an online casino, or renting a car.
Though you don’t have to show your ID to a casino employee while entering the building, if you look younger than your age a casino employee may ask for your ID. This is to prevent minors from gambling since the legal age for gambling and consuming alcohol is 21 in the United States.
If it is not for age validation, a casino has no right to ask for your ID. Except if you win a jackpot, that’s it! If you, for example, win a jackpot of more than $1,200 in a real money skill game, you have to pay taxes on it. Which means filling up annoying paperwork that comes with providing your ID. You have the right to refuse to hand over your documents, but this also means your winnings will not be paid out.