In my experience, Google Play sells so few books that a heroic effort to comply with its rather odd uploading requirements isn't justified by the income a book generates. If it goes smoothly, I don't mind following Google's little rituals, but if it doesn't go smoothly, I forget it and move on.
When Google first began offering e-publication, there was great alarm on the Kindle message board that Google would end Kindle's dominance. Didn't quite work out that way! For me, it ranks down there with Hoopla as a money-maker.
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