I really hate the concept of renting textbooks. Renting digital textbooks even more. When you take a course you are supposed to have what you learn forever. Naturally you won't remember it all, it won't always stay active in your mind, but you should be able to return to your notes and the textbook and "rehydrate" the knowledge. Discover that you can now connect it to all of the things you have learned since.
When the textbooks are rented? I feel like something deeper must be broken.