Unprecedented, That's For Sure
You don’t get to use this free tool to produce books that you sell directly to customers, circumventing Apple’s store. Think about the textbook business, where a publisher might sell thousands of copies of the same book to each school district. This isn’t just about selling iPads — Apple wants its 30 percent.
I’m not sure this is a right Apple gets. Making the software free doesn’t make it okay to tell you what you can do with the output of the software. If Microsoft made Word free that wouldn’t make it understandable for them to want control of your documents.