Came here to 2nd GOG, but there are a few other storefronts with their own game launchers & DRM similar to Steam (Ubisoft, Epic). Humble Bundle provide (sometimes a choice of) GOG/Epic/Steam keys depending on the game, and they also have a collection of DRM-free games you can download directly.
Still, seven CD-ROM game hunters is probably a good estimate..!
Excerpt from Learn You a Haskell for Great God!