It is but that is not the problem I describe. Basically the problem as I see it is there is no good way for me, the home user, to play around with FreeBSD. The PCBSD installer crashes, and I haven't quite figured out how to configure everything with a vanilla FreeBSD install. I didn't spend long trying because I know Ubuntu just works, and while I would like to try FreeBSD out I don't care enough to figure out all of the hoops I have to jump through to get it to work.
So now when I go to look for a server I am going look for a Linux server because I have had better\more experience with it. Basically that which is easiest to use by people without experience will come to dominate. Not through network effects or anything hard to reverse like that but by simple fact that people will start using the tool that makes their job easy. After they have experience with that tool they are less likely to change to a harder to use tool even if it is better(the Mysql effect as it were.)