Projectsonic: It's kinda weird really. I personally wasn't planning on even touching this thing with a ten foot pole (not my thing at all), but looking at the library it comes out of nowhere.
As already mentioned, GOG already has Hotline Miami, Postal, all sorts of games that follow the same path as Hatred. If they net a deal with Bethesda to get Fallout back you'll probably eventually see Doom on top of that. If they're trying to take a stand against something it's rather lost because of that. At least to simple people like me.
It should be worth mentioning that almost the exact same thing happened to the Avernum remakes at the time Spiderweb's items were added to the catalog, probably because at the time deals were reached GOG were still Good Old Games. It got to GOG eventually. Who knows, maybe after everything dies down we'll eventually see it come out?
I forgot GOG rejected the Avernum remakes, thinking back to that I personally thought those were rejected because they already had the originals here and didn't see much of a point of selling both the classic games and the remakes since it wasn't until we got the enhanced editions of Baldur's gate 1 and 2 as well as Icewind Dale that we got the remakes of Avernum 1 and 2. Then again we did also get Super frog HD..just can't recall if that came before or after GOG turned down the remake of Avernum 1.
But anyway you do have a point though, GOG rejects shit all the time for many reasons and they do so for many reasons and often they change their minds on it. They rejected Xenonauts sometime back for being too pricey for a indy game and here it is, Cat Lady was also rejected only to be quickly accepted and as you pointed out the remake of Avernum 1 was rejected and was brought here just before the sequel was going to be released.
So just because it was rejected doesn't mean it won't show up here. If the game turns out to be more then just a bland mediocre game that gained notoriety due to it's subject matter then it could feasibly still come here.
Sadly this is something we have to deal with if we don't want GOG to end up like say Steam right now where there are tons of total shit just getting released left and right, not saying we have to always and blindly accept it especially when they reject something that is really good for whatever reason like Braid, Thomas was alone, the old Humongous Entertainment catalog(which they also rejected) just that we have to deal with if we don't want to have this place swimming in total shit. In the cases when they reject something for no apparent good reason sure we should be vocal about it but do it like adults and not children throwing temper tantrums and going on crazy conspiracy theories or even using this as a case to bitch about GOG creating a client to help get new games and ditching the downloader(seriously move on, that was so last week.), A little tact goes a long ways and can make a case better then being a ass about it.
When Cat Lady was rejected, a thread was made, votes were cast on the wishlist, people said their peace on it and did it like adults and we got the game. Same with Xenonauts and if memory served the remake of Arvenum 1 while that did take longer then it should of though.