Fair enough, but what I meant to say is that in practice Git is always used in combination with a centralized service such as GitHub, GitLab or Bitbucket. There

Fair enough, but what I meant to say is that in practice Git is always used in combination with a centralized service such as GitHub, GitLab or Bitbucket. There is no cryptographic consensus, that is true, but the model still works exceptionally well. All modern software engineering depends on it, successfully. I never heard someone ask for a more robust trust model with network protocol consensus. I don't think anyone actually needs it.