Right now quite a few people backup their kindle books on their computer together with the PID needed to deDRM the books. And thank to those Ayn Rand books that were silently deleted from many a Kindle there will be even greater number of people doing that. People are not removing DRM at the moment, because there is no need.
When the first ads infested books appear they would provide *lots* of people with justification to strip the DRM and clean up the books.
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