The move adds another layer to the protracted dispute and brings it to an authority that has historically been tougher on US Big Tech.

Last September, Epic added its own in-app purchase mechanism to Fortnite, knowingly setting up a confrontation with Apple, which does not allow payment systems other than its own.

Apple removed Fortnite from the App Store and Epic immediately filed suit. A similar chain of events took place with Google on the Android side, though in that case, Epic can continue to distribute Fortnite on its own outside the Google Play store, while no similar option exists for iOS. Apple countersued Epic in October, claiming breach of contract.

Epic Games founder and Chief Executive Tim Sweeney said Apple’s control of its platform had tilted the level playing field.

“The 30 percent they charge as their app tax, they can make it 50 percent or 90 percent or 100 percent. Under their theory of how these markets are structured, they have every right to do that”, he told reporters.