Apple’s Battle Royale With Epic Games About to Start for Real

The legal fight between Apple Inc. and Epic Games Inc. kicks into full gear on Monday with decisions that will influence the future of app stores in the U.S. and how the world’s largest technology platforms make money from developers.

U.S. District Judge Yvonne Gonzalez Rogers will decide whether to force Apple to let battle royale video game Fortnite back into the App Store with Epic’s in-house payment option. She will also rule if Apple can block third-party apps using Epic’s Unreal Engine development software.

Most legal experts expect the judge to extend her temporary injunction for Unreal Engine, but ...