CS:GO gambling sites work by allowing users to bet on the outcome of professional CS:GO matches or participate in games of chance using virtual items from the game, such as weapon skins.
Counter-Strike Betting FAQ\n\n To do so, go to a reputable betting website with CS matches, register (if needed) and deposit the money you wish to gamble. After deciding what bet you want to make, make the bet and wait for the match results to claim your winnings.