Developers, especially the ones who offer free-for-download apps like Fortnite, rely on those in-app purchases as a key source of income. In-app purchases are the add-ons, like digital tokens, that players can buy to get different clothes or designs for their digital characters and weapons. To prove its point, Epic intentionally broke Apple's rules, which say that for in-app purchases, app developers can only use Apple's payments processing service.

The suit effectively forces Apple to defend the way it operates its App Store, the only gateway for developers who want to have their apps made available for download on the iPhone. 13, alleging that the iPhone maker's rules - for how big a cut of app sales developers need to pay Apple, and how they can even make money on the popular App Store - are anticompetitive. This time, it's fighting Epic Games, maker of the online gaming phenomenon Fortnite, which has more than 350 million players. On Monday, Apple meets a new combatant in court. Before the smartphone first went on sale in 2007, Apple even fought networking giant Cisco over the iPhone name. It's fought phone giant Nokia and chipmaker Qualcomm over patent royalties.

1 rival, Samsung, and others over the iPhone's design. Apple's iPhone is already one of the world's most litigated devices.

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