Gambling is a big industry and market for a country not to tax it. If there are nations that are free of taxes from the gambling industry, it is for sure that they're benefiting from the other sources that they have.
But it's true that gambling businesses are quite big and a government cannot avoid to tax them unless there are some clauses that they're also going to benefit while not taxing them.
The majority of the countries do tax gambling and that's of no surprising anymore.
If the news is real,the government also should analysis the data.Because not all the gamblers who playing the gambling making money.If the tax is for the gamblers who make money is the fair one,if the government announce the taxation for all the money transactions in the name of gambling into their bank account means.This leads to the biggest problem for the gamblers who was already suffer from the gambling losses.This made the gamblers to pay the additional money for the losses too.Instead the government can create the law to the gamblers who make money in the gambling.
This is very similar to the gambling regulations that they want to implement in brazil, where you will pay taxes on the profits from your bets at a percentage of 15% (last time I saw), regardless of whether you are in profit or loss.
The best thing to do is to use casinos that are not from these countries or that aren't regulated in countries that restrict or regulate the gambling market too much.