For some time now, I’ve been planning to make my older books available on ebook platforms not named after South American rainforests. After a couple of years of putting it off—I’m a notorious procrastinator—a friend and professional acquaintance in New Zealand asked why he couldn’t get my books from Kobo, his preferred platform. That set me in motion.

(It was not my first time hearing this suggestion. A reader from Canada asked me the same question a few years back.)

Previously, the on...