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.
The virus is too fast to spread without us noticing where we can possibly get it, as long as the casinos or any establishments able to passed the standards set by the government in implementing the protocols for anti covid operation clean up, disinfection and social distancing, businesses, casinos were free from any issues that may come due to covid. So if we're responsible enough we would only play via online instead of going out.