> but rarely if ever the ability to compel you to speak, outside of testifying (at least, in the US).

I don't think this is at all true. A U.S. judge would not hesitate to issue an injunction ordering you to update your warrant canary if they thought there was a good reason to do so. I'm not aware of any law (including the Fifth Amendment -- which deals only with self-incrimination in a criminal proceeding) that would prevent them from doing so. Am I missing something?