https://www.theverge.com/2018/8/10/17675054/google-play-store-android-fortnite-battle-royale

Google is warning Android users that it doesn’t carry Fortnite Battle Royale in the Play Store. If you search for Fortnite in the Play Store, it will return a notice from Google. “Fortnite Battle Royal by Epic Games, Inc is not available on Google Play,” the sign says, likely as a clarification to users, as first spotted by 9to5Google.

By saying upfront that the Play Store doesn’t have Fortnite, Google is attempting to protect unknowing users who might download some malicious clone of the app.