According 9to5mac.com

After Fortnite was pulled from the App Store for breaking Apple’s rules — sneaking in a direct payment method to get around the in-app purchase system — Epic almost immediately filed a lawsuit against Apple. Now the game developer says that Apple is terminating its account.

The App Store is designed to be a safe and trusted place for users and a great business opportunity for all developers. Epic has been one of the most successful developers on the App Store, growing into a multibillion dollar business that reaches million of iOS customers around the world. We very much want to keep the company as part of the Apple Developer Program and their apps on the Store. The problem that Epic has created for itself is one that can be easily remedied if they submit an update of their app that reverts it to comply with the guidelines they agreed to and which apply to all developers. We won’t make an exception for Epic because we don’t think it’s right to put their business interests ahead of the guidelines that protect our customers.

Apple has previously said it will make “every effort to work with Epic to resolve these violations so they can return Fortnite to the App Store.”

Source : 9to5mac.com