Epic made it clear what it was really about, when they pulled the exact same shit with google on android. Android allows the downloading of apps without using google's services. Sure they refer to it as "sideloading" instead of downloading and put in vaguely scary warnings for CYA, but it's still entirely possible to have apps on android without giving google a cut.

Tim Sweeney is just butthurt that he can't profit off of their services, without giving them a cut.