kai2: Reading through threads lately it's sad to find the number of good games pulled from GOG. I'm sure there are a lot pulled from Steam too, but here with the much smaller catalogue, it hurts.
AB2012: Indeed. It's another case where all the ARMA games removed from GOG are still on Steam (though their ARMA:CWC is also inferior to OF:CWC GOTY in missing Red Hammer). Fortunately I still have the disc version of OF:CWC, and to give the devs credit they did actually patch out the DRM for disc owners before the game even went 'digital'.
When did they patch out DRM.
IIRC the Arma games went away after gamespy shutdown and they were profiting from the DayZ mod jsut before Arma 3 came out.
Arma 2 got one last patch for steam users only unless there is a hacked version out there.