It's another method of penalizing the legit user. Legit user has to deal with all the DRM, Steam and all the Steam issues, having an internet connection, being able to connect to steam. On day 0, Steam will probably be down often from all the people trying to log on. So you may run into problems even being able to play your new purchase.
And sure, some play online, but a majority probably do not play Civ online more than offline.
Meanwhile, the hackers have no DRM, no Steam problems, and no internet required non-sense... didn't pay for it, but probably can't play online.
It's another amazing story of how legitimate users get treated like damn thieves. If you like DRM and Steam or not... this is the way it works. I've used Steam like programs before, that didn't require internet, and I am fine with those... but it's still pathetic how they treat their loyal paying customers.