Don't know how much business the casino's lost due to that stuff, but when I visited Tahoe and Vegas I during the mask craziness, I would only stay inside if I needed to.

I'd nurse my beers as much as possible inside and was yelled at a handful of times in Tahoe for not masking between sips😄
I'd also take the mask off as soon as I was in eye shot of the escalators, or doors... ! 😄