Epic side-loaded Fortnite for a while, then gave up on it in frustration. Android's side-loading was never meant for anyone but technical users like developers.
Google Play Services are also not necessarily available without going through the play store, so you lose access to a lot of functionality that people often consider part of the system (like Chromecast).
Google Play Services are also not necessarily available without going through the play store, so you lose access to a lot of functionality that people often consider part of the system (like Chromecast).