IF Epic Games uses one developer account for Fortnight AND Epic International uses a different account for Unreal, then I have a concern with Apple shutting down both.
I've actually complained that Epic didn't do two separate companies to protect its users and was therefore irresponsible in protecting its devs (and no one disagreed with me about this point [they disagreed with me in general, but not about this point]).
If they each pay their own $99 a year to use Apple's tools, then to me it's a separate issue, especially if they're not even making games with the one but only making the Unreal engine. Apple's terms may be written and support closing both, I think they prevent someone who's kicked out from getting a new account, but IF these were already established for their different "divisions" then it's not as clearcut to me...