Earlier quoted context omitted.
It's not a technical bug, but it's a deliberately made flaw - and it illustrates what will happen when after a couple of years they'll turn the servers off (The current list http://webcache.googleusercontent.com/search?q=cache:0L266ui... shows even games of 2011 disabled already), leaving the game that you "bought" useless. Digital Restrictions Management = Defective by Design.
isn't Steam also DRM and hugely successful and very popular with the gaming community?
Though, it SimCity's case it seems to be worse as I've heard people losing saves occasionally. I don't remember too many people losing characters when Diablo 3 launched.