Warcraft 1 and 2 are being removed from the DRM-free GOG.com at the behest of Blizzard, for sadly obvious reasons.
With the release of Warcraft I and II Remastered, Blizzard is delisting the original games from sale. And with that GOG ...
GOG have announced that Warcraft I and Warcraft II are going to be leaving GOG at the publisher's request (Blizzard).