I understand your point of view, but isn't that sort of the spirit of open source software? To take it and build something with it. I mean, they didn't close the repo, it's still up there, they just made the decision to not contribute back as they decided to build a business around it. Others can too.
Free software typically doesn't force you to share changes either, as long as you don't distribute the binaries. Patching GPL code and using it in a web application without ever releasing the source is perfectly fine.
The Affero GPL was designed to force the release of source even in that case. That's the only license I know which has that property though.
Free software != GPL. One could argue that the Affero GPL represents a continuation of the ideals which gave birth to the GPL, now that more and more applications have moved to being network services (something less common in 80's).
