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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.
It may not be de jure open source, but if the code is posted publicly on the internet in a way that anyone can download and modify it, it sort of becomes de facto open source (or "source available" if you prefer).
Please don't muddy the water with terms like this. Something is open source if and only if it has an open source license.