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Spammers are abusing GitHub gists for link building (gist.github.com)
3 points by inancgumus 2280 days ago
1 comments

Yes, but inspecting source, those are nofollow links. So that should eventually deter anyone trying to actually keep using that as a method.
It's entirely possible these are being used by a static site generator or some such. It only takes a real repo to use GitHub pages.