Library of Congress did change DCMA rules last year to allow consumers to modify an abandon-ware game to bypass authentication servers that no longer exist. However, they specifically excluded MMO-like games, only covering "video games that can be played by users without accessing or reproducing copyrightable content stored or previously stored on an external computer server". Still, it's at least acknowledgement that abandon-ware is a legitimate form of media that rightfully deserves preservation.

http://www.wired.co.uk/news/archive/2015-10/28/dmca-game-pre...