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China is attempting to mirror the entire GitHub over to their own servers, users report
(infosec.exchange)
This is a most excellent place for technology news and articles.
This seems like the most plausible explanation. Only other thing I can think of is they want to develop their own CoPilot (which I'm guessing isn't available in China due to the U.S. AI restrictions?), and they're just using their existing infrastructure to gather training data.