iFlow never sold books directly through their app, because the iOS terms never allowed in-app sales. If iFlow was selling books before, they were doing it through a website, unless their app was incorrectly approved.
iFlow doesn't need any clout when negotiating a cut, everybody gets the same deal:
>All sales agents get a 30% commission on the sale of a book. No one gets a different deal. Prior to the agency model, publishers typically offered retailers a 50% discount.
Apple only gets a cut if they handle the processing, i.e. sold on iOS. Books are not a subscription, they can be sold on a website outside of iOS without restriction.
Am I wrong on any of this? I got downvoted but I'm not sure why.