Which game is credited with popularizing the 'loot box' system as a major revenue model in gaming, significantly influencing how games monetize personalized virtual items?

In-game economies and virtual item purchases have transformed the gaming industry's revenue models. These digital marketplaces generate billions in revenue annually through microtransactions, cosmetic items, battle passes, and virtual currencies. This poll tests your knowledge about a pivotal moment in gaming history that changed how games approach personalization and player engagement through virtual item sales.

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Overwatch (2016)
Team Fortress 2 (2010)
FIFA Ultimate Team (2009)
Counter-Strike: Global Offensive (2013)