I love Signal, but in some jurisdictions government request for data can be accompanied by gagging orders with serious penalties for breach. I'm not sure that list can be considered complete.

Does the design of Signal's applications or server infrastructure change because of the jurisdiction? Does the information they gather or store change?

With signal can you join public/private channels without disclosing your phone number?

The last time I checked (a few years back) I only saw private groups and no way to hide phone numbers.

If that is still the case then there are less reason to have a warrant for you phone number as it is easier to access.

If you trust some random people over internet who publish anything, then my words should have the same power to you.

To be fair, those statements look a tad more official than your published comment.