Plenty of American non-porfit oganizations use Linux to fuel thier servers, and their businesses.
Of the government agencies that I know of, the FBI implements their own form of BSD (they pay some of the contributors to construct encryption techniques, and to re-write the system), and most of the labor unions use certain version of BSD to run everything that they are doing. Go to
www.unionroofers.com, plug it into netcraft, and you will see that they are running FreeBSD. Actually, enter in any name of any trade.
I also believe that the CIA is using a version of FreeBSD (although, from what I know, it is heresay.)
I don't know how it is in the UK, or by standards anywhere else in the "free" world, but if you have programmers that comprise the top echelon, albeit M$ guys or BSD guys, the US government has them working....paying them huge, and it is all closed source.
Netcraft will lie to you

(like the US government)