I'd like to think it's both. The license definitely helped drive up adoption very quickly, but it still does some things that no other library does. Still, I'm

I'd like to think it's both. The license definitely helped drive up adoption very quickly, but it still does some things that no other library does. Still, I'm sure it's just a matter of time before <insert any proprietary software here> has an open-source alternative. (Not that that's bad or a defeat -- the proprietary stuff can still be successful -- but it is a reality.)