> The argument that software that you're not allowed to use in certain ways is somehow more free just doesn't pass the sniff test for me.
Intuition. If I may, you should learn to "shut up and multiply"[1]. The various costs and benefits (in terms of freedom) are pretty much nailed down: freedom at large is simply way bigger than immediate freedoms, for a simple reason: the only freedom the GPL doesn't give you, is the freedom to further restrict your users. (Contrary to how most comments are worded here,, you don't have to contribute back changes. You have to contribute back public changes.)
The end doesn't always justify the means, but sometimes it does.
Even that isn't strictly true - you only have to contribute forward public changes. Of course, since your users have the ability to share things, and since your changes are probably "out there" you might as well contribute them back at that point and doing so usually eases development.
Intuition. If I may, you should learn to "shut up and multiply"[1]. The various costs and benefits (in terms of freedom) are pretty much nailed down: freedom at large is simply way bigger than immediate freedoms, for a simple reason: the only freedom the GPL doesn't give you, is the freedom to further restrict your users. (Contrary to how most comments are worded here,, you don't have to contribute back changes. You have to contribute back public changes.)
The end doesn't always justify the means, but sometimes it does.
[1]: http://wiki.lesswrong.com/wiki/Shut_up_and_multiply