The step came in a new lawsuit on Tuesday amid counterclaims for unjust enrichment and tortious interference with consumer relationships.
The tech giant called those claims “self-righteous” and “self-interested” in response to the complaint brought by Epic Games in August.
Fortnite’s game developer denied that the 30 percent commission was anti-competitive. It added that the battle was “a profound dispute over assets.”
Apple claimed Epic Games had broken the contract and demanded penalties.
“Epic’s flagrant disregard for its contractual commitments and other misconduct has caused significant harm to [the tech giant],” the filing reads.
“Left unchecked, Epic’s conduct threatens the very existence of the iOS ecosystem and its tremendous value to consumers.”
The lawsuit is the latest in a legal battle that began last month. Apple-Epic Games battle happened after Fortnite offered a discount on its virtual currency for out-of-the-app purchases.
In response, Apple blocked Epic’s ability to distribute updates or new apps through the App Store. Epic filed a lawsuit that points out the practices in the App Store that violates antitrust laws.
The court allowed Apple’s ban on changes to proceed as the case plays out. Fortnite’s existing rule still functions like those of Epic’s payment system.
Apple had said if Epic removed the direct payment feature to comply with its developer agreement, it would allow Fortnite back into the store.
But Epic has refused, saying it would be “to collude with Apple to maintain their monopoly over iOS in-app payments” to comply with Apple’s request.
In its filing, Apple said Epic gained from Apple’s developer and advertising tools. The game developer collected over $600 million through the App Store.
Apple accused the company, which it noted is sponsored by Chinese tech giant Tencent, pursuing a particular deal before finally breaking its upgrade contract.
“Although Epic portrays itself as a modern corporate Robin Hood, in reality it is a multi-billion dollar enterprise that simply wants to pay nothing for the tremendous value it derives from the App Store,” it said in the filing.
Apple faces more criticism of its operations, operating the App Store as the court battle between the two firms arrives.
Politicians have expressed fears at a summer meeting in Washington that Apple’s dominance of the app store was harming competition.
The European Union is now reviewing whether the activities of Apple’s App Store break antitrust laws.
Apple refuted those arguments, saying the App Store has made the delivery of apps faster and cheaper for users.
Apple’s lawsuit comes in response to a lengthy request for a preliminary injunction submitted by Epic over the weekend. The filing on Tuesday sets out a series of defenses against that motion. In other things, the tech giant insists that there were legitimate business justifications for all its acts, which would negate a broader antitrust charge.
Epic’s response to Apple’s filing is due by September 18, ahead of a full hearing on September 28.
A recent decision on a temporary restraining order made Fortnite unlikely to return to the iOS App Store in the immediate future. The same ruling enjoined Apple to take further action against another developer account that Epic used to fund the Unreal Engine.