Why the GPL rocketed Linux to success
Charles M. Hannum (one of the 4 originators of NetBSD) has posted a sad article about serious problems in the NetBSD project, saying "the NetBSD Project has stagnated to the point of irrelevance." You can see the article or an LWN article about it.
There are still active FreeBSD and OpenBSD communities, and there's much positive to say about FreeBSD and OpenBSD. I use them occasionally, and I always welcome a chance to talk to their developers - they're sharp folks. Perhaps NetBSD will partly revive. But systems based on the Linux kernel ("Linux") absolutely stomp the *BSDs (FreeBSD, OpenBSD, and NetBSD) in market share. And Linux-based systems will continue to stomp on the *BSDs into the foreseeable future.