Arrogance was what actually killed them. They picked fights with Google and RedHat and then showing up at conferences with shirts that said "we don't accept pull requests" tipped the scales so that RedHat and Google both went their own way and their technology was now pushed out of 2 of their biggest channels.
(I don't know of any T-shirts saying "we don't accept pull requests". That sounds made up. We very much did accept pull requests... a great many of them).
