warrant canary assumes the maintainer is under coercion. But if the maintainer is untrustworthy, their warrant canary also won't be trustworthy, since it's trivial for the "sale" and the new maintainers to continue the existing warrant canary as though nothing has happened.
Aren't these also useless even for their original reason as they can just be given a demand from the legal system to keep updating the canary as if nothing happened?