They would always have that kind of option because they do know that gambling businesses does generate more income than with other industries so its no brainer
Your post is quite perplexing. Obviously some of the casinos are being owned by billionaires such as Sheldon Adelson and Lui Che Woo. But a majority of them are small to medium sized businesses. In the United States for example, there are small casinos run by various native American reservations. And an increase in tax level is more likely to have an impact on these smaller casinos rather than the larger ones.