Yes, you are right. If every business can follow the government rules, that can help the country's economy grow and they can have better development in the future. So if the casino which can make a lot of money from the gambling industry can pay the taxes which will be bigger than the other business, I am sure that can help the government. Every help from the business owner will be worth it for the government to run their countries and help other people in this pandemic.
What if the casino is virtual and how do you propose on taxing them if they are registered and located in a free heaven. It is impossible for them to tax them, all they can do is impose a complete ban of online gambling and encourage gambling houses to register with the government to get the approval to run the site, you know and everyone knows that it is impossible to come with that kind of restrictions.