Gambling tax should be banned. It is a bit like double taxation. People are taxed when they earn money. When people gamble, they are pretty much giving their hard earned money away. The casinos pay tax on their earnings. Why should the winners have to pay tax on their winnings when it has already been taxed twice? Besides, they have probably already lost far more than they ever won anyway. Give the gamblers a break!
The owners of casinos and gambling websites make a lot of money without contributing to society. In fact, gambling is largely seen as an evil to society. To make up for this, gambling institutions must give some of their profits to the government, so that some of the money can go to help society.