For what it is worth, Cory Doctorow used to license his books with Creative Commons Attribution-Noncommercial-NoDerivs. You can even find direct and free downloads to his books on his website [1]. At the same time, his publishers were selling hardcopies.

Unfortunately, at some point he stopped doing it. He explains

> There is also the fact that, in the time since Creative Commons licenses were negotiated, publishers have entered into agreements with the large ebook retailers that allow for price matching. This is in part an artifact of anti-trust litigation, but it means that if someone somewhere offers the book at $0, it technically allows all of the other ebook stores to offer the book at $0 as well.

> Thus far my publishers have been good about grandfathering in the CC-licensed books that I already had, but for the last couple of books I haven’t done CC licensing, in part because of the real fear that Amazon could set the price at $0 and there would be no recourse for my publishers—not even the recourse of not letting Amazon sell the book, because of deals ensuring that if Amazon sells one book of a publisher’s, they have to sell the whole catalog.

[1] https://craphound.com/pc/download/

[2] https://www.authorsalliance.org/2017/05/09/a-good-guy-offeri...