Which customer retention innovation most significantly transformed player loyalty in the gaming industry between 2015-2020?

In the competitive world of gaming and virtual worlds, customer retention strategies have evolved dramatically. Major gaming platforms and publishers have developed innovative approaches to keep players engaged and returning to their ecosystems. This poll tests your knowledge about a groundbreaking retention strategy that changed how the industry approaches player loyalty and engagement. Can you identify which major innovation truly revolutionized gamer retention?

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Battle Pass subscription model pioneered by Fortnite, creating recurring revenue and daily engagement through tiered reward systems
Steam's trading card system that rewards players with collectible digital items for time spent in games
PlayStation's PS Plus monthly free games program that gives subscribers access to select titles each month
Nintendo's My Nintendo rewards program that gives points for digital and physical purchases redeemable for exclusive merchandise