Not many previously closed source, fully-commercial SaaS web apps have been completely open-sourced. If you'd like to debate what "not many" means, I suppose we could, but I think that's missing the point. I, for one, can't think of any.
When most startups shut down, they take all of their code with them. I'm kind of surprised that anyone's response to doing something to changing that status quo would be negative. I mean, I'm sure you'd like to have us just give it away for free, but why? Why would we do that?