Which gaming platform first introduced the concept of an in-game 'item shop' that allowed players to purchase cosmetic skins with real currency while keeping gameplay balanced?

In the rapidly evolving gaming industry, virtual marketplaces have transformed how players purchase in-game items and downloadable content. These digital retail environments implement sophisticated e-commerce strategies that blur the line between virtual and physical economies. Test your knowledge about one of the most successful virtual marketplace innovations that revolutionized monetization in gaming!

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League of Legends (2009)
Team Fortress 2 (2010)
Counter-Strike: Global Offensive (2013)
Fortnite (2017)