Which game is widely credited with pioneering the 'free-to-play with microtransactions' business model in Western markets that revolutionized gaming industry revenue streams?

In-game purchases and virtual economies have transformed how gaming companies generate revenue. This trivia question explores a pivotal moment in gaming history when a major shift occurred in how players interacted with virtual goods and how companies monetized their games. Test your knowledge about this significant evolution in gaming business models!

This is a live public trivia poll on AIPolls.Net. Vote and see real-time results.

Team Fortress 2 (2007) with its introduction of purchasable cosmetic items and later free-to-play conversion
World of Warcraft (2004) with its subscription model and later addition of in-game purchases
Counter-Strike: Global Offensive (2012) with its weapon skin marketplace
Candy Crush Saga (2012) with its energy system and purchasable boosters