As I recall, that's only for use in the classroom, to get students hooked. If you're doing research, or anything other than teaching a class, you pay for private repos. Feel free to correct me if I'm wrong.
Bitbucket gives you a free unlimited account if you sign up with a .edu email address.
[Edit: You actually get five free repos. Still limited and not at all the deal you get with Bitbucket.]
Re:Classroom for GitHub
by capnrefsmmat on Tuesday September 22, 2015 @12:19PM
(#10259580)
No, GitHub gives you 5 free private repositories for any educational use if you sign up with an academic email. I use mine for research.
Re:Classroom for GitHub
by johndbritton on Tuesday September 22, 2015 @12:20PM
(#10259593)
Researchers are eligible too.
You can check it out here: https://education.github.com/discount_requests/new