Linus Torvalds knew that "the GPL would turn
as many people away as it would attract" and exactly of that (it attracted a lot) he considers his decision
for the GPL "to be the
best decision he ever made" (though he disagrees with the too strong ideological believes of RMS "I want to (be able to) reprogram my printer's software"... sorry what?!). Linus used the big wave (pro & cons discussion on the GPL) for getting his Linux off the ground (which he succeeded with). And he is so incredibly smart and doing things right (showed it again with git... slamming CVS&SVN basically to death in a talk he gave).
Google, Facebook and others are open sourcing a good amount admitting, that this attracts skilled people (probably to be hired) and benefits their code (in the open)... "companies that use your code are never competitors". Though they remain the major force behind these projects, e.g. being accused to be show offs (hiphop vm) "look how great we are, but you'll never get it to work".
The default license on git hub is MIT. Sorry GPL, but forcing everyone to open source on modifications they make. NO way for me: Take it (http://www.use-the-tree.com) and make it proprietary (and better and make a business), you are so welcome. When you succeed with that, then congrats to you.
Enterprises want to pay and they go for FUD "no accountant was ever fired for buying IBM/Microsoft/HP". It's hard to break into that and they are even right with it, because when buying from a large vendor they are also buying into the huge support/manpower.
How does Ubuntu want to generate income? Selling shirts and Coffee-cups with "Ubuntu" printed on (okay advertising for Amazon in Unity) and diverging from "Linux for people/the desktop" to Ubuntu-Server/Cloud? But the fact that they sell T-Shirts and coffee cups (and others sell likewise silly things, like boxes with CDs and printed manuals), wow... that's a confession of failure (for this type of doing open source).
So "open source (almost) everything" (2011) [1], what a late(!) and great contribution to this discussion (free from ideological believes and focused on business).
Does RMS still live for free on the Harvard/MIT campus? And sorry I was in the group that was turned away back in the times.
[1] http://tom.preston-werner.com/2011/11/22/open-source-everyth...