Well, I'd say it would be more acceptable in a free book than one that is sold for real money, but it would seem that Gutenberg take more care than was done with this Gutenberg digitizations of PD/copyright expired face two volunteer proofreads per page, so lets call that equal to the services of a single proessional proofreading. If they think a raw OCR is acceptable for an ebook, would they produce a foreign version using Google translate?
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