Seems a bit dangerous to be using the automatic third level domain of github in this way. This is not the first time I've thought a project was endorsed by github when it was not.
Edit: Now, that I think of it, copy was a second red light, yet I still thought it was coming from github. It only shows how good a perception github as a company has.
Separately, interesting that (IIUC) this project allows donors and donees to choose whether they're willing to grant/accept MIT/AGPL. If project is successful will be interesting to see how often each choice gets made. But I don't think it is explained all that clearly on ... giving.github.com :)