Before Fortnite's massive success, which innovative marketing strategy did Epic Games introduce in 2014 that dramatically changed its business model and industry influence?

Epic Games is a titan in the gaming industry today, known for Fortnite and the Unreal Engine. But the company's journey to success wasn't always built on battle royale games and cutting-edge graphics technology. This trivia question explores a pivotal marketing decision in Epic's history that helped establish its position in the gaming ecosystem before Fortnite became a global phenomenon.

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Making the Unreal Engine available for free with a revenue-sharing model instead of upfront licensing fees
Creating the first gaming influencer partnership program with YouTube creators
Launching the Epic Games Store with exclusive indie game publishing deals
Introducing the first cross-platform subscription service for multiple games