tfishell: Indeed, I really didn't expect them to take this opportunity. I thought it was a situation similar to Hatred, though I guess with Hatred perhaps GOG thought, because of the game content, the PR might be too negative ultimately.
HunchBluntley: Likely a combination of that + the game itself (the hyper-edginess/"satire" notwithstanding) being not very fun or interesting, by most accounts. I'd say they made the right call that time. Not sure about this time. We'll have to see whether their curation holds up, or if they just start pooping out whatever their partnered publishers release, regardless of quality.
On that note... On the other hand, having the game exclusively on GOG for a period of time, especially if it appeared riding the PR wave, could have been financially rewarding. As for the game itself, it's not much different from Postal 1 imo; I could understand rejection based on tech issues (I recall seeing game footage where the game chugged) but not so much content, kinda. I lean more towards the "don't agree with decision to not bring it" but that's mainly because of all the uncompleted wishlist votes, and it's not worth arguing or complaining over.