Google found a bug in the Fortnite installer app, which allows malicious apps to download on ones Android phone. Epic Games decided to withdraw its app from Google Play Store and instead make it available through its own app. This was because the game developer insisted on going it alone, and one of the reasons is not having to share the app-revenue with Google. Google didnt make the details of the exploit, and Epic immediately sprang into action and released a patch within 48-hours.”]
Source: https://hackercombat.com/fortnite-developers-are-definitely-not-happy-with-google/