Oh yeah, good point, projects can't bring their own user authentication system, so all your contributors have to have github accounts.

So OK, sure, github is as bad as slack.

> Don't all contributors have to at least set up an account through the web interface?

You can clone/pull anonymously from github and eg: email patches.

I'd say using github just for hosting read-only/read-mostly git is a bit like running http on IIS or email on Exchange - or indeed a propietary XMPP server that allows federation.

I'd prefer Free projects to use Free infrastructure - but building on established open protocols is good. Contrast with bitkeeper: you'd have to reverse engineer the protocol to pull/push - or with slack: there's no way to set up your own server snd federate with it.