To the best of my knowledge, none of Epic's Mac apps broke Apple's terms and conditions. Their iOS app did - and the usual punishment is to reject/remove the app that breaks the rules from its respective App Store. Other developers (such as Facebook) have gotten away with much worse, without even that happening to them.
Moreover, when Apple rejects or removes an app, the developer is allowed to keep developing apps (including the same app on a platform where the rules are less restrictive), provided these apps don't also break Apple's terms and conditions. Apple only ever terminates a developer's entire account in extreme cases, such as outright releasing malware - or, in Epic's case, because Apple wanted to make a very public example of them.