I was reading an answer to another question, which says on the topic of a reviewer potentially contacting an author under a special set of circumstances
Some would say you should wait until it is public, so as not to break the anonymity of the reviewing process. Others think it is fine to reveal yourself and contact the author directly
My first thought was "The anonymity is there to protect the reviewer, so of course he can give up the protection and initiate contact". But then I realized that maybe there are other people whose interests might be hurt if this happens.
So, let's assume that the anonymous person (the reviewer, and in some cases also the author), always benefits from his own anonymity. Is there somebody else who is interested in the reviewer remaining anonymous?