[abc-xyz]

Indeed, and they've resorted to DDoSing GitHub precisely because it's so difficult (in terms of value lost) for them to block it (https://en.m.wikipedia.org/wiki/Censorship_of_GitHub).

Sure, they could setup a selfhosted GitLab and mirror repos, but doing so would severely hurt them.

[est]

Kids these days forgot how Google or Gmail was banned.

Yeah it's very difficult to "block Google" and they are "afraid are afraid to ban" Gmail.

Why makes you think that a gov use tanks against its own people have anything to fear?

[abc-xyz]

Obviously there is a limit to what GitHub would be able to get away with before getting banned..

My point is that GitHub currently provide so much value to Chinese research and tech that banning it would be extremely costly for them. Would they ban CNN for writing a negative article that not a single Chinese citizen had seen? No doubt. Would they ban GitHub for hosting a repo sharing the truth about the Tiananmem Massacre, the concentration camps, etc? No, at least not until this repo gained a lot of traction in China, and the question then is how many people would they allow to see the content before finally pulling the trigger? I'm imagining a lot.. And I also suspect that they would respond by attacking GitHub/Microsoft and even open up for GitHub again when they felt the storm had been weathered. FYI, all of these assumptions are based on their past actions with regard to GitHub and other websites/companies.. if you read up on it then you would probably reach the same conclusion.