On my ISP, BSNL, I can access them over https. However for my friends', it's not working at all. For some changing DNS to Google or OpenDNS fixes the issue, but not for everyone.

But why GitHub :-( Earlier Pastebin was once banned saying it was used to share links to torrents of movies. Now some idiot might have thought even GitHub is also same as Pastebin. This is just my speculation.