Every time I see similar questions, I just wonder why companies such as Signal do not put in place a mechanism to veto changes across countrie. If they had dev

Every time I see similar questions, I just wonder why companies such as Signal do not put in place a mechanism to veto changes across countrie. If they had developers in, say, France, who would need to accept changes made somewhere else then a single country could not force such secret modifications. Of course an app is actually a binary, so there must be a way to verify that code + compilation = the published binary.