[yellowapple]

While it's true that the GPL and the distributed nature of Linux development helped GNU/Linux proliferate, that isn't the reason why the BSDs didn't. In reality, they were encumbered by legal problems due to being derivative works of AT&T's Unix; the ensuing legal war of attrition caused a lot of folks to be unsure of whether or not they could legally use any of the BSDs without having to pony up for Unix licenses.

As a result, Linux was created (Linus Torvalds has said that if Hurd existed or if the BSD legality issues were resolved, he wouldn't have felt the need to develop the Linux kernel), and folks jumped onto that as the preferred free Unix due to it being unencumbered by the massive legal warfare taking place in BSD Land (of course, SCO would eventually bring the battle to the GNU/Linux world, but by that point, Linux was already well-entrenched).