I follow Ilona Andres' blog, and they have answered this (from their own perspective) a few times - buy or enjoy anywhere, just don't pirate the book! They do get more money from the physical version than kindle, but they're happy their books are being bought, rather than stolen.
Fine-for-now t1_j2a53wz wrote
Reply to Best way to purchase books to support the authors by Vizzenya
I follow Ilona Andres' blog, and they have answered this (from their own perspective) a few times - buy or enjoy anywhere, just don't pirate the book! They do get more money from the physical version than kindle, but they're happy their books are being bought, rather than stolen.