Casinos are the most affected in this pandemic because social distance is an impediment to providing their services in full and are now limited. The Covid19 can be presented even following the strictest controls because a small error could open the door and infect anyone. We can only take advantage of bets on games that can be carried out with a lot of effort today.
They could still operate but as you said with limitation. That is a big plummet for their sales for real but it's better than to have nothing during this pandemic.
It is the reason why most of us who gambles online don't have any problem at all. But for these certain industries and casinos, they have to adopt the new norm.