Epic has installs on phones which paid the iPhone tax. Those can't be updated and are made worthless, causing damage to Epic. Removing an app in violation is one thing. Removing them as a developer and preventing them from updating apps which have been paid for may violate something, somewhere. I'm sure Apple's contract absolves themselves of all responsibility, but there is at least some argument there.

That's the best I can come up with. Personally I won't run an iPhone.