For me, a 15% tax on gambling can never stop most gamblers from gambling, it will take above 50% to make enough gamblers reconsider or limit their gambling activities. This 15% is on their citizens but it is worse with
gambling operators in the country, they have to part ways with 55-58% of their income for various taxes in the country. That's huge.
But this recent ban on online casinos is not meant to gain more taxes but to make sure that those online casinos gaining from their citizens who are not registered in the country also pay taxes to the government.
Tax will never stop gamblers from gambling even if the government imposing so high such as 50% or more.
You are wrong my friend, it will affect them, the higher the tax, the higher the discouragement, this is normal economics everywhere in the world. Though some ardent gamblers and the addicted ones may continue to gamble all the same, the percentage of those who were supposed to gamble must have drastically reduced. Taxes have reasons beyond the government's revenue target, it also dissuades people from those activities. Imagine the government of a country increases the taxes to about 85%, do you think the majority of people will continue? Of course not. People mostly gamble for money but if they can only earn 15% of the money they narrowly win, what is the point of gambling?