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.

The “Fortnite” maker claims the tech giants colluded to place onerous restrictions on app stores created after Google lost an antitrust case.

The game publisher alleges Samsung and Google are breaking US law by prohibiting app store alternatives on Samsung devices with features like Auto Blocker.