Way to show how silly you are... every freaking PC game ever made has had a disc check, other than online activated games (which are worse).
Way to show how little you know. Plenty of PC games never had disc checks. Quake and Quake II spring to mind immediately. Same with Unreal, S.T.A.L.K.E.R. Shadows of Chernobyl and System Shock 2. None of those games had online activation.
Despite what you might think, disc checks have not been around forever. There was an era where disc checks did not exist. I miss it.
You have been duped into believing this is the norm and that, as a consumer, you should just accept it. That's fine if you want to. I however, do not.