This is true. With the uncertainty surrounding our environment, if you are a gambler, you will prefer to play online rather than risk yourself from the virus. This is the advantage of online gambling sites. No physical interaction with the players.
And with this epidemic, macau casinos were losing millions of dollars everyday when they shut down last month.
Though they are re-opening, I don't think many gamblers will go to the casino because the risk of getting infected is still high. The cure is not yet in full blast though there are already promising vaccines being developed.