I see no reason why this cannot be used for things other than textbooks (unless there is some fine print I haven't seen). For example, it would be vastly superior to Amazon's proprietary fixed layout format that's currently available for children's books and comic books (except for lack of 'panel view'), largely because it can have actual text (potentially accessible for tts etc) and smoothly scaling vector graphics. You could have a PDF file that is an order of magnitude smaller than the equivalent rendered as a series of images, reducing the download charges Amazon assesses. And annotation, and notebooks, etc.
They should dump their fixed layout format and add more features to this (panel view, audio, interactivity etc.)
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