[mpchlets]

I think you are misunderstanding the wording: "as you may authorize" - that bit is about you making it public, and only about you making it public - nothing else. You authorize it to be made public, github says the same as "By setting your repositories to be viewed publicly, you agree to allow others to view and fork your repositories"

github is just not using lawyer speak, which is definitely cooler.

[Uchikoma]

The point of the post was, you give Atlassian a license, you don't give Github one. In this regard your TOS is the same as the Atlassian one.

[mpchlets]

"However, by setting your pages to be viewed publicly, you agree to allow others to view your Content. By setting your repositories to be viewed publicly, you agree to allow others to view and fork your repositories."

You are granting permission of ownership through forking to anyone - including github.