I agree with that, once a government is established, by right of conquest, orderly process or revolution, they become earthly authorities and are instituted as governments among men (Romans 13) who rule by God’s authority.
Caesar was much more tyrannical than George III ever thought of being and Jesus, Paul and the Apostles never called for revolution, to the contrary they said give to Caesar what is Caesars. They only opposed Caesar where it was in direct conflict with God’s command.