Self-hosted isn't 100% reliable either. Nobody is that good. I've done serious high availability (financial system that would land on the front page of the New

Self-hosted isn't 100% reliable either. Nobody is that good. I've done serious high availability (financial system that would land on the front page of the New York Times the way Github lands on HN), and it wasn't 100%. And the overhead of high availability is incredible. No way would I do self-hosted version control. I have better things to do than babysit servers for commodity services.