On a serious note, I'm a bit surprised that GitHub makes it trivial to compute the rate at which new repositories are created. Isn't that kind of information usually a corporate secret?
Is there any reason for GitHub to hide this information though? How could it be used against them? (I understand many companies default to not expose any information unless forced otherwise.)
Also, having a sequence implies at least a global lock on that sequence during repo creation. Repo creation could otherwise be a scoped lock. OTOH, it's not necessarily handled that way --- they could hand out ranges of sequences to different servers/regions and the repo id may not be actually sequential.