It may be true that github focuses on the author (after all, projects are github.com/AUTHOR/project), but I'd say that focus is secondary to the code. Compare a project page on sourceforge (e.g. http://sourceforge.net/projects/azureus/) with one on github (like https://github.com/jquery/jquery). A sourceforge project page is just a vague arrangement of links, while github shows you the source and README right away. The author is given about the same amount of space on the page in both cases.