[e2le]

Pirating a game introduces concerns over malware, in some cases it might be low risk however buying and refunding would eliminate those concerns.

I also consider DRM to be malware so GOG is the better choice in my opinion.

[earenndil]

The game is distributed as an archive accompanied by an executable unpacker. The unpacker is signed by GOG, and it can verify the hash of the archive, meaning no malware concern.