[derefr]

I would take that further: I want to work for a company where you need a form from the VP to allow any work in the company to go un-open-sourced. Everything is MIT-licensed and posted to Github by default. Only the secret-est of secret sauce gets redacted.

[law]

Why not GPLv3?

[sokoloff]

If I had to guess, it might be because, while philosophically more "pure", I believe GPL is a less pragmatic license if the goal is getting your software more widely used.