I know that it is offtopic and i want to appolagize, for this, but i just want to add my 2 cents to the stalker keys situation. I contacted support about this, since i have all three games and a GOG forum fella told me about the keys beeing not actually serial but gog redeemable and asking if it is possible for me to gift them to him. I want to do this, since the guy is always friendly and cool in general. Back to the topic, i always tought that these keys are 4 the multiplayer. I checked however if i can redeem them and was pleasantly suprised that i can. However, i mailed support, since there is no official info of extra game keys destributed with each copy. The answer i got was that these keys are meant strictly for the multiplayer and the customer service employee sounded generally very surprised from my question and asked me to clarify what made me beleive that these keys could be redeemed for a copies of the games. I send him back one screenshot of the first game key in my library, and one more from the same key pasted in the gog redeeme subpage available for redeemtion. That was yesterday and still no answer. In addition, i played stalker soc in multiplayer for around 10 min yesterday and was not asked for the key at any point.
It is clear that very collosal mistake had happened and clearly those keys are not ment for providing extra game copies. I can speculate here, but probably there is an error in the software resposible for the serial keys generation or human error. However, in my oppinion we should be decent human beeings and do not share these codes anymore, because this is a mistake and when mistakes happen, such that cost money, someone has to pay the bill. I can imagine someone losing his/hers job, since destribution of free keys ( what essentially is happening) without agreement between gog and the publisher is major breach of trust and contract. The case is even worse,since as far as what i understood from the posts in this thread, the already redeemed keys are generating even more (in some cases ) redeemable keys. So that is everything i wanted to add. Lets dont give away something which is not ours to give away. I hope that nobody from the gog employees will have problems, because of this.
Just my 2 cents
It's possible that this was a mistake on GOG's part, and it's also possible that that particular employee simply didn't know about this. It's not the only game that spawns free keys. If it is a mistake, its a huge one that's been going on for at least 11 months. I'd think someone on the GOG staff would have noticed what was happening by now. I'm also surprised that they got right back to you, but it's been 6 days and I still haven't heard anything from GOG regarding the Dying Light situation.
I don't want anyone to lose their job, either. One day, after shopping at Safeway (a national chain of grocery stores), I checked my receipt and saw that instead of being on sale, a package of ground turkey was given to me for free. I was concerned that someone in the meat department had accidentally entered the wrong amount of the discount and would maybe be fired or have the lost revenue come out of their paycheck, so I called the store's customer service and told them about it. The following day, I noticed that all of those packages of ground turkey were no longer for sale. If this is a bug, I hope GOG can fix it without pulling the games from their store.