Suddenly "www.com"'s value has skyrocketed in the eyes of scammers. How about:
* login.<target_site>.www.com -> login.<target_site>.com
* members.<target_site>.www.com -> members.<target_site>.com
Even some carefully chosen <target_site>.www.com's will now be valuable:
* login.www.<target_site>.www.com -> login.<target_site>.com
What a stupid idea...