I don't think it will win in any court because the virus is everywhere and it's invisible the accuser will have a hard time proving that he really gets the CoVid in the facility, they could have got it in their homes in while travelling while in the market or while in the street it's hard to established the fact on this case but I don't like casinos open at this point of time people should only stay home and restrict their moves.
A lot of countries already managed to pin point the location of a contamination source. It might not be very difficult to prove that a certain place contaminated it's users.