In video games, skin gambling is the use of virtual goods, often cosmetic in-game items such as "skins", as virtual currency to bet on the outcome of professional matches or on other games of chance. It is commonly associated with the community surrounding Counter-Strike 2 (formerly Counter-Strike: Global Offensive), but the practice exists in other games such as Electronic Arts's FIFA. Valve, the developer of the Counter-Strike series, also runs the Steam marketplace which can be interfaced by third-parties to enable trading, buying, and selling of skins from players' Steam inventories for real-world or digital currency. Valve condemns the gambling practices as it violates the platform's terms of service.
Valve added random skin rewards as part of an update to Global Offensive in 2013, believing that players would use these to trade with other players and bolster both the player community and its Steam marketplace. A number of websites were created to bypass monetary restrictions Valve set on the Steam marketplace to aid in high-value trading and allowing users to receive cash value for skins. Some of these sites subsequently added the ability to gamble on the results of professional matches or in games of chance with these skins, which in 2016 was estimated to handle around $5 billion of the virtual goods. These sites, along with Valve and various video game streamers, have come under scrutiny due to ethical and legal questions relating to gambling on sporting matches, underage gambling, undisclosed promotion, and outcome rigging. Evidence of such unethical practices was discovered in June 2016, and led to two formal lawsuits filed against these sites and Valve in the following month. Valve subsequently has taken steps to stop such sites from using Steam's interface for enabling gambling, leading to about half of these sites closing down while driving more of the skin gambling into an underground economy.