You have an M9 - if it didn't come preloaded with CM then the rumor or report was false.
Android Central in their review said that it came in the M9 Suggestions folder, not installed, and that the whole folder was best deleted.
http://www.androidcentral.com/htc-one-m9-review
The Samsung S6 comes with it baked in and operational.
http://www.androidcentral.com/some-samsungs-galaxy-s6-software-sends-mixed-message-about-performance
So, I don't know how thinly you want to slice the relationship wording. Samsung and Cheetah announced a joint venture, it's baked in. HTC has it as optional malware, no doubt for a kickback.
Cue the new owners who want to explain that it either isn't that bad (yes, it is) or that we're not as smart as Samsung or HTC (go away) in 3... 2...