I have been getting a rash of people attempting to register who have not provided an e-mail address. Unsurprisingly, some of such registrations have come from our banned friend(s) who just can't seem to get enough of us.
As a result, I am requiring that all new registrants provide an e-mail address.
I have neither the time nor the inclination to deal with people I don't have to or want to and, yes, what the requirements are to get an account here are completely based on my judgment.