What I do frequently see with Github, is that they've managed to work their way into almost being beyond reproach. This letter feels like an example of that...Almost like Github needs someone to stand up for it in light of some meanies picking on it.
It's a good product. We should give credit where credit is due, just don't forget it's a product. A (by all indications), very profitable product that wants to make money off you. That is its goal and purpose in life, and OSS furthers it. For the record, I think this is a good and healthy relationship, but we shouldn't pretend it's some FOSS group or non-profit out struggling to provide us with Git hosting.