If I already started a warrant canary, the only way you can compel that to not work is to compel me to continue posting. But you can only do that after right no

If I already started a warrant canary, the only way you can compel that to not work is to compel me to continue posting. But you can only do that after right now, so you cannot possibly redact the canary itself. And you could only compel me to keep posting if you'd already served a warrant.