Email and messaging services are just as essential today to the network infrastructure as are operating systems to desktop computing environments. There also exists a nice boundary between the service providers and users.
But the network infrastructure is all 'cloud' and shit, increasingly wrapped up with the software being provided as a service, and that boundary between service providers and users makes the GPL pretty useless. The service providers never redistribute the software!
I only see two groups of people trying to make money distributing the software itself: spammers, and sellers of shit to pile on top of Exchange.
