Talking about the supposed dangers of OPDS catalogs:
That's some crazy stuff, if something like that can happen overnight to the best e-reader on Android. Evokes some chilling memories of Stanza's fate. I must, therefore, say again I very much share Wulf's concern that precautions should be taken that nothing like this can ever happen to Marvin. Can you imagine waking up one day only to discover that Marvin is gone?
Android users at least have their alternate markets to download Moon+ Reader from, but not everyone is willing to jailbreak their iOS device.
(In fact, something similar happened half a year ago to the Korean developer of what I find to be the finest video app on iOS: AVPlayerHD. Apple found something objectionable -- software/hardware-wise, apparently -- in a September release of the app, and it took around 3 months for the developer of AVPlayerHD to reinstate it in the App Store. Good luck to the Moon+ Reader developer to get this resolved as soon as possible.)