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Authors often receive much less than that for each book they sell - the best you can get is self-publishing on Kindle or something where you can net 70%: https://kdp.amazon.com/en_US/help/topic/G200634560

People generally know this, and they generally don't care.

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Anyone can buy a laser printer, print any book, sell it, take 100% profits, and anyone can buy and read it.

But you can't do that with a mobile app because only Android users can use it, while anyone with an iPhone can't use the app unless you submit to Apple's rules.

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