I suspect most people that are truly addicts will just pursue online gambling now that the physical casinos are closed, though it's also true that the online gambling experience is very different from that of physical casinos, and not everyone enjoys online gambling. This sort of shock hopefully might also be enough to snap people out of their current mentalities and realize what they've been doing recently for those suffering from the negatives of gambling.
Some online tournaments for games like CS:GO are still going on last time I checked, and there's always the possibility that some of these people start looking into esports gambling.
Yes, when a person is addicted to gambling, even when the casino is actually closed, they can still find different ways and options to satisfy their psychology, here it may be as you say, the epidemic stops them with actual casinos but it doesn't stop them with online casinos, even many people have organized gambling at home, taking advantage of the chaotic society to avoid the police. But inside the negatives, I also feel this could be an opportunity for gambling addicts to come back, crises and families can change their behaviors and habits