Basically, if you get Fortnite from the Play Store, you get Fortnite. If you get Fortnite outside the Play Store, you get the Epic Games Launcher, which installs Fortnite. The Epic Games Launcher on Windows was updated into the Epic Games Store, when they added support for third party titles.

So yes, Google put a kibosh on an OEM pre-installing a competing store, not just the game.