To some point, I believe, one just needs to test the service of what they are advitizing, even if it's not made compulsory out of their own will, as it will go a long way at least if a question is being raised upon the project on one's signature, the person can be able to explain properly if it works.
This.
Wearing a signature doesn’t imply full endorsement of the underlying service, or makes the wearer part of the support team, but I guess every signature bearer should have a basic understanding of the service they are advertising, with a minimal idea of the peculiar feature.