Fortnite was recently removed from Apples’ App Store due to violating its payment terms and condition. Apple said that Epic has added its own payment system for in-app purchases bypassing the revenue share of 30% if someone makes In-App purchases from them.
This seems to have violated both apple and google platforms as it skirts the rule in which Epic had to share around 30% of its revenue share made through the in-app purchases.
Apple removed it from the app store after there was a price drop in the V Bucks that the company announced.
Epic Games has filed legal papers in response to Apple, read more here:

