Github has already been blocked by China, albeit briefly. After Chinese bloggers posted 'sensitive' content on the site, Github was blocked for a few days in 2

Github has already been blocked by China, albeit briefly. After Chinese bloggers posted 'sensitive' content on the site, Github was blocked for a few days in 2013 until there was a big pushback from developers in China, including Kai Fu Lee, who's well respected by tech and government in China. The outcry forced a backtracking from the government. I wouldn't recommend this, but if a movement started where developers of highly popular projects started putting political content in their README.md, China would probably revisit the issue and consider blocking again.