Since launching in late 2017 Fortnite has earned more than $2.4 billion, a staggering amount of revenue for a video game that is free for anyone to play. The battle royale title makes its money from virtual items like special outfits or victory dances that players can purchase from an in-game store. Given the breakout success of this business model, companies throughout the more than $100 billion video game industry have been scrambling to develop a credible Fortnite competitor.