Antitrust laws have been a thing since the past 100+ years. Epic's argument is that Apple and Google's policies violate those laws.Blacklist between companies exist since the beginning of everything, that's not something new
As a product holder I can freely decide if I want to work with you or not
Its like when Valve ban someone from Steam, only difference is that we are talking about Epic here and not some random indie devs that no one knows (With all due respect for them)
It is very much possible that in a decade or so we'll see the Supreme Court require Apple and Google to alter their policies. I'm no lawyer, but I think it's really hard to argue Apple doesn't have 100% control over software distribution on their platform which currently exists in a duopoly they share with Google.