You can get some royalty fee's reduced by launching on Epic Games Store but that's it.
Most Unreal Engine games are distributed by Steam.
ALSO, fun fact while we're here.. to display the Unreal Engine logo on startup you're supposed to ask Epic Games for permission; but since it's the default project splash screen (meant to be replaced) people just assume that they want the publicity and that it's part of using the engine- Epic doesn't feel like enforcing this because they don't see the point.
So, feel free to remove it, and if you see it, just know that the developers very likely didn't read the agreement they signed when they started using the Engine :)
Source: the last unreal engine technical advisory board in Stockholm; I too didn't read this from the agreement ...
It's often a cover to mask loading times anyway.
Bonus points if the launcher is the only thing blocking it from working properly on Proton.
Or if it's a multiplayer game that, when it crashes, by the time you get past the crash reporter, the unskippable launcher, the unskippable logos, the unskippable epilepsy warning, and the unskippable title screen intro animation, the window for reconnecting without penalty will have passed.