It seems a lot of the games in the PC section are full commercial titles (warez), many of which are still being sold online at various sites. For example:
Alone in the Dark 1 & 2 (GoG.com)
Star Control II (GoG.com)
Blood (GoG.com)
Descent 1 & 2 (GoG.com)
Doom 1 (Steam)
Doom 2 (Steam)
Duke3D (GoG.com)
I'm sure there's many more, those are just what I found within a few minutes of looking. Even the games that aren't being sold anywhere today are still copyright and should not be hosted; new "old" games appear on GoG all the time. I suggest the entire section be taken offline until the legality of each individual game is checked.
Alone in the Dark 1 & 2 (GoG.com)
Star Control II (GoG.com)
Blood (GoG.com)
Descent 1 & 2 (GoG.com)
Doom 1 (Steam)
Doom 2 (Steam)
Duke3D (GoG.com)
I'm sure there's many more, those are just what I found within a few minutes of looking. Even the games that aren't being sold anywhere today are still copyright and should not be hosted; new "old" games appear on GoG all the time. I suggest the entire section be taken offline until the legality of each individual game is checked.