If I remember correctly (no way to check it now) iFlow Reader let you browse for books in-app, but the Buy button took you to their web site to purchase. And you could purchase books on their web site. So I'm not clear on why they fell afoul of the 30%-to-Apple rule, and others have not (at least not yet). It seems rather a technical distinction, and one BeamItUp could have addressed by launching the browser to shop in their store, rather than waiting until the last click to do so. I assume they must have determined that making such a change was not going to propitiate Apple.
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