I cant understand how a gambling site can take an advantage of the isolated people because of the corona virus. Although people will have more time to spend for online thing but it does not mean that they will be interested to do online gambling. Those isolated people will be focusing on finding news, updates about the latest situation as well as focusing on keep themselves safe in many aspects especially for finding daily needs.
Well, you are both right and wrong, depending on the people. There are some people who are like the people you think, they are isolated but they are looking at news, they are following whats going on, they are reading a book, find other ways to entertain themselves, or maybe like you said they don't have money, they are simply too poor to gamble right now, have more things to pay now and less money so they do not think about gambling.
However, there are also gamblers, gamblers who have money, gamblers who like to spend time here, gamblers whose entertainment is mainly gambling. Those people will gamble more, that is the topic here, people who are not mainly a gambler but just gambles for fun may not be around but the real gamblers would increase their amount for sure.