&gt; Prevented from being published via established channels, then.<p>Kindle Direct Publishing has been around about as long as the Kindle (they were, IIRC, announced at the same time), and is backed by the dominant online book and ebook retailer. Its a pretty well-established channel.<p>&gt; The analogy still holds, because in the 1950s you could still publish content considered communist in photocopied zines.<p>The analogy does not, even remotely, hold, because such photocopied zines would not be available via major retail outlets, whereas Kindle Direct Publishing is directly sponsored by the dominant retail outlet.