https://wccftech.com/fortnite-for-android-might-require-manual-apk-sideload/

Fortnite took the Battle Royale genre by storm with its unique free-to-play model. The game was rumoured to release alongside the Samsung Galaxy Note 9 and remain exclusive to the device for 30 days before being supported on other smartphones. Today, a Reddit user dug deep into the Epic Games website and found interesting results. Fortnite for Android might not be available to download via Google Play and has to be downloaded via Epic Games’ website. Here are two images that walk a user through setting up Fortnite on an Android device.

The image on the right has the download link which redirects the page to the image on the right. If the game were to be hosted on the Play Store, it would redirect to the appropriate Play Store listing. However, the image asks users to permit downloads from outside the Play Store, indicating that the game might not be on the Play Store at all.