Uber using github?
So, riddle me this...
You're a for profit company and you store your secret sauce on a third party's system?
Granted there are two types of repositories, public and private. If you're using a free repository, then its public and anyone can view your code. If you're using a private repository, then you're paying for the privilege of only letting certain people to access your code.
Assuming that Uber isn't that stupid of a company and is paying for the use of a repo, then they have the rights to GitHub's logs on who accessed what when it comes to specific and relevant accounts.