+1 for the outreach. They definitely lost control of the announcement, since it got out yesterday.
The nice thing about it is, everyone who keeps their Git repo up-to-date (and who has the transfer.fsckobjects setting set to true) has a complete copy of the Git repo. And GitHub provides APIs to pull other stuff. I think the hardest thing to move would be sites on GitHub Pages.
So, since I can pull out relatively easily, I'm gonna give them the benefit of the doubt.