No you think every piece of Chinese text written on the Internet belongs is under the control of Chinese government?
Github is a US company that hosts their service in US, Chinese government cannot possibly have sovereignty over that. If you believe there is righteous reason behind it, then you are supporting internet terrorism.
China has sovereignty over Chinese citizens. If you believe there is righteous reason to circumvent Chinese sovereignty with the collusion of some subjects of the Chinese regime, then you are supporting Internet terrorism.
(The problem with rhetoric is that it can point both ways. Study the definitions of "sovereignty" and "terrorism" in international law, then try again.)
Github is a US company that hosts their service in US, Chinese government cannot possibly have sovereignty over that. If you believe there is righteous reason behind it, then you are supporting internet terrorism.