Which gaming company first introduced the revolutionary 'loot box' monetization model that became a multi-billion dollar retail innovation across the gaming industry?

Gaming has evolved far beyond simple entertainment into complex virtual worlds with thriving economies. Virtual item sales, exclusive skins, and in-game purchases have revolutionized how gaming companies generate revenue. This trivia question explores a landmark innovation in gaming retail that fundamentally changed how players perceive value in virtual goods. Test your knowledge about the business innovations that transformed gaming from a one-time purchase model to ongoing commercial ecosystems!

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Valve Corporation (with Team Fortress 2 in 2010)
Electronic Arts (with FIFA Ultimate Team in 2009)
ZT Online (Chinese MMORPG by Giant Interactive in 2007)
Blizzard Entertainment (with Overwatch in 2016)