Gambling is not going to help the economy to get recover unless it is a country where people from other countries gambles a lot than their own citizen and there are only few places in this world fits into such criteria and they have enough casinos and also facing lot of restrictions while running their casinos.
At least, if the casino can reopen, the casino can contribute to the taxes section, and the casino will give the tax to the government, which can help the city or country to recover the economy. We know that the gambling industries are a multi-billion industry, that taxes will be bigger, which will help the city get more income.
Besides that, if the casino reopens their business, they will ask their old employee or the casino will reopen recruitment to the public, so there will be an opportunity for people to sign in as the employee. That means people will have a way to have an income for them and buy their daily needs. But that will depend on how the government will allow the casino to reopen in this pandemic.