You realize if they released the DRM free version and the DRM version there would be literally no point in a drm version existing in the first place...I really hope your post is sarcastic,,,because if not...this is some weird kind of paranoia.
Sometimes, that happens when PC games get re-released later - especially on GOG.
Riddick: Dark Athena had DRM (Tages, IIRC) in its retail-box, which never got patched-out by Atari BTW - yet it's re-release on GOG certainly did not have any DRM.
That's just for starters!
STALKER: Clear Sky from retail had Tages, yet later re-releases Gamersgate + GOG have DRM-FREE versions.
Two Worlds 1 + 2 had their own homebrew DRM from their original versions - yet, GOG got them DRM-FREE.
Risen 2 was originally requiring Steam everywhere and had their CEG DRM, but GOG later got a Gold Edition re-release without any DRM.
I could keep going, but you get my point.
Certainly, there's a market for making game-owners buy the same game again. 