Hey is a free download, but it's a revenue stream for Hey. And since it's free on the App Store, Apple makes nothing, and Hey reaps the benefits. That's dumb. I am not on Hey's side.
The only sketchy thing is Apple letting bigger companies (Netflix) get away with doing the same thing, except it makes sense from a corporate politics standpoint because tons of people would be pissed if Netflix pulled their iOS app in protest, and no one would care if Hey went away.
I've bought a bunch of apps on my Mac and Apple took a $0 cut from them (evidently I didn't buy them from the app store). Last I heard, Apple was profitable before 2008 when the 30% cut was instituted.
Point being, of course, that I pay for the hardware (as I do for the iPhone). I don't see that, in addition to that, Apple is entitled to a 30% cut of every app I buy -- meaning, I'm paying 30% more than I should, never mind I already paid an absurd price for the iPhone itself.
Thought experiment: imagine if at WWDC on Monday, Apple announced they had secretly pushed a mandatory update, already installed behind your back, that somehow forced you to buy any apps from the Mac app store, essentially turning your computer into a glorified iPad. How long do you think the Mac would survive? My guess is -- not for long.
EDIT: and by the way, they do charge developers for the privilege of developing for their ecosystem -- $99/year, to be precise. Maybe you think that's low -- but then again, Apple willingly chose that price.