I wonder if someone will get caught stealing unlicensed software hosted on places like GitHub, leading to some kind of a case in which an implied license is discussed. Furthermore, I wonder what kind of license they would decide is implied in that situation (if they decided that there were one) - BSD style, or GPL style?
We claim no intellectual property rights over the material you provide to the Service. Your profile and materials uploaded remain yours. However, by setting your pages to be viewed publicly, you agree to allow others to view your Content. By setting your repositories to be viewed publicly, you agree to allow others to view and fork your repositories.
"you agree to allow others to view and fork your repositories." Sounds pretty permissive to me.