Won't be buying Civilization 5
Just found out that this thing installs via Steam. I don't put crap like that on my computer.
Flight Simulator and other chat
https://forums.simviation.com/phpBB3/
https://forums.simviation.com/phpBB3/viewtopic.php?f=44&t=156373

Even the disk version?

Then stay offline, you don't have to be logged in.
However when first installed it is compulsory to go online and it automatically installs all the neccessary updates... It is possible to turn automatic updates off, but only once it's installed and done the first update.