I was referring, though, to all the surrounding aspects of GitHub, e.g. issue tracking / discussions and discoverability. Quite a lot of projects have no online presence except GitHub pages. Let me again draw an analogy with Facebook: Of course there are many ways to contact people - (e)mail, phone, instant messenger - but a lot of people rely on Facebook to stay in contact with each other and don't bother to exchange other contact information.

Besides, censorship is far more subtle and pervasive than closing shop. It changes the perception and values of the community, instead of driving the participants to some other place. Also there are surveillance and subversion issues. When it becomes common to install binaries directly supplied by GitHub, I better trust them not to include any (targeted) malware.

I'm not sure I'm with you on the second point. I think I understand where you're coming from, but I think it's a reach to their from this incident. Being required to use civil language on a public site seems like a reasonable requirement to me.