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The rules in my country do not have a winning tax because gambling is illegal in my country, therefore there are no rules regarding taxes, if gambling existed in my country, there would definitely be a winning tax and so on.
I would probably agree that if gambling were legal, then the government would certainly consider imposing taxes. The government will collect taxes from every line that they think will benefit the country, even if marijuana, crystal methamphetamine is legal then the government will also tax it, but fortunately it is also illegal.