Which gaming company first introduced the concept of 'microtransactions' for cosmetic items (skins) in a major competitive game, revolutionizing free-to-play product development?

The gaming industry has evolved beyond simple entertainment to create complex virtual economies and marketplaces. In-game and platform-based stores generate billions in revenue annually through virtual goods, skins, and digital collectibles. This poll tests your knowledge of a significant product development milestone that changed how games monetize their platforms and influenced the entire digital retail landscape.

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Valve Corporation (with Team Fortress 2's Mann Co. Store in 2010)
Riot Games (with League of Legends' Riot Points system in 2009)
Blizzard Entertainment (with World of Warcraft's Pet Store in 2009)
Epic Games (with Fortnite's V-Bucks system in 2017)