While it’s turned on, it automatically keeps users from installing apps unless they come from “authorized sources” — namely, Google and Samsung’s app stores. Epic claims there’s no process for any rival store to become “authorized.

Last year, Epic Games prevailed in court against Google in an antitrust case that alleged the Google Play Store is an illegal monopoly. Now, Epic has filed another lawsuit against Google that accuses the company of colluding with Samsung in order to make it difficult for users to install the Epic Games Store on their mobile devices.

"Fortnite" video game maker Epic Games on Monday accused Alphabet's Google and Samsung , the world's largest Android phone manufacturer, of conspiring to protect Google's Play store from competition.