If you have already downloaded Fortnite to your devices, it will work fine. Otherwise, Fortnite developers will now not be able to submit new apps or updates.
Apple made a decision to terminate Epic Games from the ‘App store’. Apple also said that Epic has been creating support issues, which cause users to contact Apple Care. The latest development in the Epic-Apple dispute, which began earlier this month when the developer introduced a new mode of support for direct payments in Fortnite. Attempting to circumvent the 30% cut that Apple takes on App Store payments.
This made Apple remove Epic from the App store, and there is no effect for “UNREAL ENGINE”. Which is also manages by Epic but from a different account.