Well, I guess I've got a Linux version of Megabyte Punch, which GOG doesn't have. And A Bird Story, which I've been interested in. Otherwise, not my favorite bundle on Groupees. Far, far, really far, from the worst bundle they have put together though.
Interesting. Groupees does NOT
include a Linux version of A Bird Story as a DRM free download. If you have A Bird Story on GOG, it does include Linux.
So to recap:
Megabyte Punch - GOG No Linux, Groupees yes Linux.
A Bird Story - GOG yes Linux, Groupees No Linux.
Who makes the call on which places sell all three versions of a game or just one or two? If I was the game dev I would insist that it be consistent everywhere my game was sold DRM free. As for steam I have no clue how they work they almost seem like a different platform in and of themselves.