Your optimism would be touching, if it wasn't coming in the defense of such flagrantly hostile behavior.
Even if this clause did apply only to Android recompilations and not to ports, I trust you'll concede it is not status quo ante with Apple's already-appalling pricing terms.
Apple has a monopoly in the iOS app distribution game, so their pricing terms are appalling for a different set of reasons (regardless of what they are you must agree if you want to ship the app). While I think Amazon is playing hardball, they in no way are the only way to sell Android applications. If the terms aren't agreeable, just don't use their store.
Even if this clause did apply only to Android recompilations and not to ports, I trust you'll concede it is not status quo ante with Apple's already-appalling pricing terms.