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Our settings in GBS allow for 20% of a book to be viewed, and no more. As you'll see in the attached image, there are pages removed from the preview.
At almost 900 pages, that's a lot of preview pages, so it can seem as though the entire book is available. The setting is the same on amazon.com, as well as most other preview systems. For what it's worth, research shows that the more of a book that is available, the higher the likelihood of someone purchasing.
Thanks for taking the time to write. --Allen