I had to install some program and connect online to PLAY A SINGLE PLAYER GAME? I have the CD already and entered my CD key. Why does it need validation?
Oh MAN. I forgot about those times, hand typing in a 36 character CD key that was spat out by a dot matrix printer with questionable typeset legibility…
And importing foreign copies because they sold for cheaper in other countries. I still have a Korean box copy of Call of Duty 2. After buying one, my household needed a second so that I could play at the same time as my sibling, and didn't want to spend a whole $50 for the privilege. They would even send you a copy of the key in email while you waited on the physical box to show up, because the importers knew what they were doing.
TF2 here, when Microsoft laughed at the idea of continously updating one game instead of doing sequels or paid expansions, ya know because that used to be unusual, and shit-canned all updates for the Console verison I moved to PC... and... then switched back to playing the console version because my PC couldn't play online games worth a damn back then.
Then I abandoned my Steam account to rot... until Portal 2 came out and paying full retail price for a Portal sequel felt silly, so I just got the Steam version since if I recall that was not only cheaper but came with a bunch of other games in this thing called a potato pack that also gave me Super Meat Boy.
Then I realized that playing on consoles, paying for Xbox Live, and risking my physical media getting lost or damaged.. was kinda silly.