Is this common? Do libraries such as Tensorflow occasionally license portions of themselves only for non-commercial use? I ask because when CNTK was first shar

Is this common? Do libraries such as Tensorflow occasionally license portions of themselves only for non-commercial use? I ask because when CNTK was first shared it was also under a non-commercial license. It seemed to subsequently drop off the radar for many people (eg. It wasn't mentioned in Stanford's ConvNet course or in Udacity's Machine Learning course).