However, isn't it not fair that they ask people to wear a signature campaign while they are thinking about thinking about getting the person accepted? They are basically asking for free advertisement.
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. Besides, they are not going to wear it for too long before the manager accepts participants. The only time when it becomes a problem is in a case where a user who is in a current campaign wants to apply to another and it requires that they wear the advertising signatures and avatar before applying.