Maybe they will hide some income and not report it to their government because of the high taxes.
This is true that business owners have options to avoid tax. And guess what, there's a legal way of it called tax avoidance.
However that requires critical steps so instead of doing that, owners are complying with the usual and common process to avoid the hassle.
Tax avoidance is legal , Tax evasion is illegal.
If they do tax evasion, it will make them in trouble because they try to break the regulation and end with their license revoked.
If they can tell the government about their income, they can get a tax deduction not to pay a big taxing because their income does not reach the government's limit.
It will be better for the casino to tell the truth based on the real situation and condition of their casino, so the government will not think they are trying to avoid tax avoidance.
Maybe they will hide some income and not report it to their government because of the high taxes.
That's their other way to lessen the tax that they should be obligated to pay. It's been happening with different businesses and that's the reality that the government can't chase.
They might have some of those businesses that might not pay the right tax but still they'll pay but with lesser tax due to their low income declaration.
Somehow, the government can find if something wrong happens and if the casino does not pay the taxes based on their income, the government will trying to chase them and make sure the casino will pay.
I am sure the casino will have a side business besides having the casino business because they have much money to have or create the other business.