[virgilp]

That's an interesting question. Couldn't they distribute a "Fortnite loader" through Play store? Since Fortnite is free-to-play, the loader wouldn't charge anything, so it wouldn't technically violate any policy. Seems like an interesting workaround to avoid giving Google the paycut.

[lern_too_spel]

Unfortunately, the Play Store has a policy that prevents publishers from distributing competing app stores via the Play Store.

[virgilp]

But what if you distribute "Fortnite"? Free to play, no premium functionality, free "upgrade" - except that the upgrade is from outside the app store. And once you get it, you can start paying for stuff. I don't think this qualifies as "an app store", since it's not an app store/ you can't download other applications from it (just the premium version of this one).