Which gaming company first introduced the concept of 'microtransactions' in a major mainstream title?

The gaming industry has undergone remarkable transformations since its inception. From arcade machines to immersive virtual worlds, gaming companies have continuously pushed boundaries with innovative hardware, groundbreaking software, and strategic marketing campaigns. This trivia question focuses on a pivotal moment in gaming history that changed how developers approached virtual world monetization and player engagement strategies.

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Bethesda with 'The Elder Scrolls IV: Oblivion' and its controversial horse armor DLC (2006)
Electronic Arts with 'FIFA Ultimate Team' player packs (2008)
Valve with 'Team Fortress 2' cosmetic items (2010)
Epic Games with 'Fortnite' battle pass and cosmetics (2017)