The last time I corresponded with Brian, he indicated he was rather busy with other projects, including his work. I suspect he has let it lapse in error, but I wouldn't be surprised if he did it on purpose.
Maintaining a web site, especially one with a forum, it not a part-time task. I don't have a forum on mine, but even then, answering the e-mails requires several hours a day. I can't imagine how much time Brian has spent.