Deleting GA after ending

and upon notification that the key didn't work did you either a) delete the GA or b) contact the vendor and then provide the correct key to the winner? Did the key mistake make you delete or did you fulfill the GA?

Got a little long, sorry. I wanted to be clear on my point, and not to feel judgemental or strict just for the sake of keeping short :)
I personally never did it, because for me easier to find a friend who wants the game and give them to try if it works - but on the other hand seen giveaways who said potentially not working key, either delete or contact creator to sort it out. Sometimes I joined, sometimes I didn't because it didn't worth the hassle.
But regarding this I've seen your relatively new, so some think that occured in the past.
Groupees had a Gemini: Heroes Reborn in a bundle, which was unavailable in germany. ROW copies on SG, everyone enters. Later they got germany-only keys as well for each buyer, which can be only activated in germany - sometimes there are weirder region locks that has no listing in SG, or local bans making it harder, people usually write that in description. Yet people joined the germany-only giveaways, and some was flaming afterwards that they don't care.
Another time giveaway had a key that was possibly not working, but creator wrote that he has 2 keys, one not working but he can't remember which one, contact him if there's a problem he will gave the another, working one then. Winner won, didn't work, refused to accept the second key (for the same game!) because he was adamant that the creator did that as a fake, and wanted to get him suspended.
There are some people on SG who wants to cause harm, who would join giveaways like OP wanted just to win it and make problems - not because they respect the rules, but because they can mess with someone. and in my opinion they are 100% assholes. Because if anyone should complain about potentially non active keys is the support, but support has the rule that if the two person agrees on it, they can delete it. From that point it's a legit thing to ask the winner to agree on delete, but he can't be forced and doesn't have to. But at that point, why did he even joined the giveaway, if someone lists the potential risks and you don't like them, you don't go there, simple as that... because of this I think it's the complaining person who's the asshole, not the creator.
But with everything - I seriously wouldn't recommend for anyone to make a (especially low level) public giveaway for a key that's not sure that works, and can't be replaced. Best way to avoid any problem is to avoid anything, and anyone who can cause problems, so giving to smaller group or whitelist is the best solution.
(I had keys for similar games. And I would be lying if I'd say I didn't think about CV - or surely no problem with GA. I always picked the later :)

that's your mistake to answer to my whole thread commenting only a single word.

So, Let's define assholes (as I intended) as: "people that didnt carefully read the GA creator rules and/or advices, or -even if he did- he broke these rules".

We could think these kind of a GAs as an agreement: enter the GA only if you agree with what I wrote in the description (allow me to eventually close it if unfortunately the key doenst work). Of course I am confident the key works otherwise I wouldnt create the GA, anyway I cant guarantee because it's a year-old key that I found in my old stuff.

I dont accept that people claiming the game if something goes wrong after reading this. Am I wrong? If yes, why?