I imagine Apple would come down on them pretty hard in the App Store if they did that so for most applications it's enough of a deterrent that most places would

I imagine Apple would come down on them pretty hard in the App Store if they did that so for most applications it's enough of a deterrent that most places would not do it. I also think that because Apple can mostly control which addresses and how many of them there are it can control the spam issues enough to avoid that problem. If not... then yea that's gonna happen in a few years. Would be short sighted for Apple to not do it though.