I guess I don't get how this is censorship. I may be wrong, but I don't think Apple is telling people that they can't create, distribute or consume porn. They are just saying that they don't want to sell it in the App Store.
Since when does censorship require the act of stopping people from producing the content in question? Apple is removing these apps from their store. It's the very definition of censorship.
Comparable situation: the head of your local library decides to remove all books that have overtly sexual content. By your definition, is that not censorship?
Is certainly is, and what Apple is doing is every bit as disgusting as a library censoring content. I think this is a really stupid thing for Apple to be doing.