The real added value from Github is not Git support per se. It is the knowledge that you won't need to do what the author is about to do; maintain one more service by yourself.
It's not that it is a particularly daunting task, so isn't maintaining your own mail server, mailing list, NAS, blog... But it piles up, and at the end of the day you're probably better off not wasting your time supporting things that other people can do well enough (and probably cheaper).
It's not that it is a particularly daunting task, so isn't maintaining your own mail server, mailing list, NAS, blog... But it piles up, and at the end of the day you're probably better off not wasting your time supporting things that other people can do well enough (and probably cheaper).