The tussle dates back to August 2020 when Epic Games, the maker of Fortnite, filed an antitrust lawsuit in an attempt to obliterate the walls that have given Apple exclusive control over the iPhone app store since its inception 14 year ago.The judge ordered Apple to allow apps to provide links to payment alternatives outside the app store, a requirement that has been put off until the appeals court rules.Monday's arguments are expected to open with Epic lawyer Thomas Goldstein trying to persuade the trio of judges — Sidney R. Thomas, Milan D. Smith Jr. and Michael J. McShane — why Gonzalez Rogers should have looked at the iPhone app store and the payment system as distinctly separate markets instead of bundling them together.A lawyer for the Justice Department will also get a chance to explain why the agency believes Gonzalez Rogers interpreted the federal antitrust law too narrowly, jeopardizing future enforcement actions against potentially anti-competitive behavior in the technology industry.During his testimony in lower court, Cook argued that forcing Apple to allow alternative payment systems would weaken the security and privacy controls prized by consumers who buy iPhones instead of devices running on Google’s Android software."