and tell them to have social distancing between the other. But it is better to suggest the people wear a mask without any exception still.
The social distancing plus masks plus good ventilation system (address the post above) would be god way to cope the viral aerosol spreading inside casino, but again only the top rated ones have enough room to spread the distance between the playing tables and slots. However many casino are trying to utilize the available space as much as possible.
It is what suggested by the government. Wearing masks and social distancing between the table and the player can help the spreading of the virus. But we don't know if all of the casinos apply those protocols since I don't think that the government will interfere and comes to the casino place. We can hope that the casino uses that way and not just because of the money purpose.
The small casino can apply that too, but they need to reduce the number of the table because they should limit the number of people who come to that place. If the casino succeeds with that, I am sure the government will appreciate their work, and perhaps use that casino as the best model that every casino should follow.