[satvikpendem]

Wealth is a positive not zero sum game. It is not transferred except in the most literal cases like lotteries and casinos.

[WalterBright]

Gambling is not a transference. The gambler is buying a chance to win money. It's an equal value for equal value.

Zero sum are things like taxes, where the government just takes it, or robberies.

[satvikpendem]

In casinos you transfer your money to the eventual winner, a 1:1 transfer minus the house's cut.