I look at this story as a wakeup call. Of the four titles that I now have available on my Amazon author's page, three of them do have DRM protection, and I regret doing that. It is too late to change that. Once you choose to protect it with DRM, it cannot be undone on Amazon's system. When, and if, I migrate these titles to other services, I will remove the DRM.
The newest title, Glory or Hell, does not have DRM protection.