Which gaming company first introduced a 'Battle Pass' loyalty system that has since become an industry standard revenue model?

In the competitive world of gaming, player retention is everything. Loyalty programs have become sophisticated tools that keep gamers engaged and spending. This trivia question explores how one major gaming company revolutionized loyalty within the industry through an innovative approach that has since been widely adopted. Test your knowledge of how the business side of gaming keeps players coming back for more!

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Epic Games (Fortnite)
Valve Corporation (Dota 2)
Riot Games (League of Legends)
Activision Blizzard (Call of Duty)