Most retail companies seem to be in a DRM or not at all type of situation. I guess they have a meatgrinder setup to add it to all books they get in, and generally find it difficult to have exceptions. Plus, sometimes they may not have the ability to have exceptions legally speaking. I have heard of contracts where all books from X will require DRM, whether or not you can get it without DRM directly from X. My guess is kobo simply does it to all to avoid the headache.
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