With the launch of the Epic Games Store, Epic Games challenges the dominance of Steam and its developer Valve ("Portal," "Half-Life") in the game marketplace. Epic Games has taken Google and Apple to court over the high commission fees they charge developers for selling apps on their platforms (up to 30%).
On top of that, Epic's Unreal Engine is a powerful software tool that independent developers can use to create their own games. It comes free on the Epic Games Store, a market similar to Steam.