On the other hand, do you really want random people on the internet to be able to inject objects into your git repository by creating a branch or whatever? Especially after SHAttered, that's a huge liability that sort-of justifies the "you take yours and go over there" approach.
Of course not. You want to send them a patch and have it show up in their "inbox" on Github as a pull request. There's no reason to put pull requests into the git repo.
