The first three Fallout games are no longer available on Steam in addition to the removal of the seminal RPG series from GOG.com. There's no indication that the series is returning to GOG.com, but Bethesda tweets the games will return to Steam, saying "We’re working to return classic @Fallout games (1, 2, Tactics) to Steam and will provide an update when they’re ready to go," explaining they were removed to update some details: "We have to remove existing publisher info, legal text, etc." Thanks GameSpot.