I have not seen a manager ask users to wear a signature while applying, it is usually the applicants that wear it thinking it will increase their chances of getting accepted.
They do actually, i have seen two or more campaign managers request that applicants must wear the signatures and avatar before applying but it doesn't mean anything since users can still remove the advertising codes and avatar when they are not accepted.
I haven't seen such a rule in at least seven years. Can you share which campaigns are in question here?
Of course, I hope you don't count some trash bounty campaigns run by some wannabe managers.