Back before 2004, QNX could have still been relevant as there was still a lot of OS experimentation from the user/developer themsevels. They could have attracted enough people to carve a niche even in the desktop space at that time.

After beos failed, I played/developed with QNX until they pulled the rug. I was on it full time on my main dev machine. I loved it.

When they closed it I got severely burned to the point that I will not touch a any closed development platform. I see from the license they didn't change a bit.

Not that it matters anymore.. they're largely irrelevant today except for whatever existing markets they already have. It would be fooling to choose QNX today: we now have good alternatives, and all of them with open licenses.