In a nutshell, I summarise it like this: I see Open Source Software is a public good. As a public good, it doesn't belong in any proprietary platform, nor should orgs of any kind be in a position to gate keep it. We should rather host it on a public, peer-to-peer network that everyone can have access to.

Centralization is not a small problem to solve, and this looks like it might have done just that. More than censorship, I think the worst problem with github is long-term viability / reliability: they could pull the plug tomorrow and most people would likely lose everything but the raw code.