Actually, it does. When you upload code to Github, you are effectively "dual licensing" the code to them under Github's terms. Github is not bound to any other

Actually, it does. When you upload code to Github, you are effectively "dual licensing" the code to them under Github's terms. Github is not bound to any other licenses you may have applied to your license, because it did not agree to those terms. It only agreed to the terms spelled out in the Terms of Service. Of course, there are edge cases in which you could upload code to Github that you do not own, for which I do not know the answer to.