Maybe other non-essential businesses are opened too?
Well, I don't consider most games in typical physical casinos as part of essentials. Their enclosed nature makes it even more risky. I would just have the good/safe ones outside or in well ventilated areas rather than opening up for business in enclosed space.
Of course, playing in a casino is not something that is extremely necessary for a person. I wouldn't go to Las Vegas right now. However, do not forget that all people are different and someone really needs to relax and gain strength from this fabulous holiday atmosphere, which is constantly there.
Indeed, in Nevada, everything is much more complicated with this. They get a lot of money and taxes from tourists who come primarily to play in Las Vegas casinos.
However, the economic situation in the United States is quite acceptable. If necessary, they can start the printing press again and print themselves another few trillion dollars.
How long do you think they can print out trillions without worrying about massive inflation, you cannot shut down the entire country and expect everything to be sailing smoothly and if they are not opening up industries and markets it will have a major impact on the economy as you cannot expect the economy to recover without doing any business, gambling industry is huge as many multiple industries are dependent on the gambling industry including tourism alcohol hotel and other trades in the business but it does not mean that we need to get rid of the protocols you need to follow during pandemic.
I'm not an economist. However, I can say that if these trillions and trillions of new dollars were left only in the United States, then they would have very serious inflation. However, they send dollars around the world and thus export their inflation to all other countries.