Apple ToS and conditions are ultimately irrelevant. Epic isn't looking for a cheaper deal.
Epic looked at the prevailing political winds and decided that if they ever could get the US government to force third party stores on iOS, this would be the time. They are absolutely right.
Yep. A lot of news media companies are questioning Amazon’s lower App Store fees and membership to a program that Apple only just recently revealed. Apple allows lower fees for this program in return for integrating certain iOS features (Siri is one examples). This program only includes three members. These companies are inquiring about what exactly did Amazon do to be included. They want the same opportunity.