I've noticed a lot in the SFF genre, including my current fiction read: Joe Abercrombie's latest release The Devils[1].

You'll see something like the following on the bottom of book details:

> At the Publisher's request, this title is being sold without Digital Rights Management Software (DRM) applied.

[1] https://www.amazon.com/dp/B0D3CB76TV

All Tor books (the publisher, not the privacy tool) are DRM free.