Imposing tax for 15% is high for the winners or for gambling earnings but that is enough to make gamblers start reduce their gambling activities. But that doesn't makes addicted gamblers will stop playing gambling because that will not affect to them.
That is no problem if the government closed over 2000 sites when they don't meet the policies from the government. The government can still trying to get the tax from the other business. But yes, I agree that the government must created jobs for their people so they can use their time to work and not to playing gambling. Besides that, the government must educate their citizens about the danger of gambling.
And if a person has free time from work, which he wants to spend only in this way. Does he really need to give up gambling? Well, that's a definition of all this.
Well, yes, even such a tax will not be an obstacle for dependent people. They don't give a damn about such a thing. This state of affairs may not look very good, but there is no particular choice.