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Do you think? Ok
Of course. Each copy of the repository is equal, yours, mine, Github's, and every other one in existence. Github, Bitbucket, and other sites just give you a "convenient" web interface to make it nicer. You can set up your own with opensource alternatives, like GitLab.
Whose server is it?
GitHub? According to the © on their site, it's a company called GitHub, Inc. I don't know anything about them.
That's my point
What? It doesn't matter what GitHub might do. Even if they decide to take down their web site tonight, Bitcoin doesn't care, and neither do we. We have thousand of copies of the Bitcoin code repository, and GitHub's isn't special.
ok thanks, but it would be nice for boitcoin core dev to gather on a censorship resistant platform that doesn't have community guidelines
Github has one copy of the Bitcoin code repository. Git is decentralized and what Github might do is irrelevant.