Pretty cool that Linus Torvalds invented a completely distributed version control system and 20 years later we all use it to store our code in a single place.
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Hardly surprising, though, social networks are prone to centralization (due to network effect), and GitHub & its competitors (anything that offers git repos + issue tracking + fork-ability, really) are social networks.
Also, GitHub offering private repos for free right after they got acquired by Microsoft helped a lot. A lot of people, myself included, were using gitlab.com for private repos at that time