Because Epic Games found a way to skirt app store revenue kickbacks by allowing gamers the option to pay more for V-Bucks through Apple, or, get them at a discount by buying them directly through the Epic Games store.
Apple wasn't a fan of that, and then it didn't take long for Google to pull the title from its Play store as well, but that doesn't mean Fortnite players can't enjoy the title on their iOS and Android devices.
If you're one of the 2.5 billion worldwide Android users and you want to play Fortnite on your device, there are a few things you to consider. First, make sure that your device is sporting the minimum requirements to play the game: you'll need at least 4GB of RAM and a decent enough processor to play it.
On Epic Games' website's FAQ section, the developer let's folks know how they can play the popular battle royale title on an Android device: "You can download Fortnite on Android via the Epic Games App on the Samsung Galaxy Store or epicgames.com. Google has blocked your ability to update or install Fortnite via Google Play. Players with Fortnite currently installed on their Android device via Google Play can still play version 13.40 of Fortnite."
As far as specifications go, Epic writes: "Fortnite is a high-fidelity game that is compatible with devices running 64-bit Android on an ARM64 processor, Android OS 8.0 or higher, minimum 4GB of RAM, and GPU: Adreno 530 or higher, Mali-G71 MP20, Mali-G72 MP12 or higher."