any commercial rtos shop where QNX may be appropriate is either using 1. some wacky expensive proprietary rtos that you've never heard of, 2. freertos or 3. real-time linux depending on what they need. asking what makes QNX a compelling rtos when freertos exists, is widely supported and used, and has an MIT license is a very valid question.
further, no one in embedded actually cares what RTOS you used. they are all similar enough that you won't get stuck if it's a brand new RTOS
further, no one in embedded actually cares what RTOS you used. they are all similar enough that you won't get stuck if it's a brand new RTOS