Can a gifter request a new winner for no real reason?

No. There's always a reason, even if it's not entirely obvious. If you're not sure why, feel free to contact support and ask what gives, but you must link the giveaway or we can't help you (there's no current way to track wins that were rerolled away from you).

i dont think so..

there is always a reason

and support dsnt reroll that easily as well..

maybe u already had the game or something

The next "legal" reason is you are in his "blacklist". He seems like a douchebag though, if he did have a blacklist he could have included it inside the giveaway for all to check...No hard feelings to anyone. Good luck :)

Maybe you didn't activated your previous wins and forget about that? Some guys don't like that and can reroll their giveaway

I'm glad you asked the question but, I'm sorry it happened. I have wondered about this myself.

^^^ What Jade and Shahbaz said.

When a giver wants to reroll, they have to contact support and give a valid (acceptable) reason. Support checks the evidence he or she provides, checks to see that the reason is valid, and may then decide to allow the reroll. Basically, you have to prove that the person who won was not qualified to enter the giveaway or failed to respond to attempted contact over a week's period.

There has to be a reason because I believe you have to tell support why you are re-rolling.

One possibility of what happened is something I've seen reported about once a year (usually by the gifter) where a single-copy giveaway is awarded to two different people.

It won't be granted. Open a ticket and we will try to see why this was the case.
A possible reason is due to yesterday's site outage. Because of the problems, there were a few (not sure how many) giveaways with only one copy that generated two or more winners. Obviously, cg had to remove all but the first winners on each. Regrettably, this is not the first time this has happened.

So no one else is curious if the last reason mentioned by OP is a valid reason?

I won a game months ago, a giveaway from a mod/support/admin, doesn't matter. He/she never send me the game, and six months later contacted me. I get the game two months after that giveaway (traded with a friend), so he/she couldn't give me the game because I couldn't activate it again. So, he/she requested a new winner, 6 months later, removed the "not received" from his/her account and I didn't get my never-received-but-won-legitimaly game. So yes, there are more than one reason to do this.

note: i don't remember who was, and don't want to get a game (it was Revelations 2012, arhg! xD Just wanted to tell my story, similar to this :)

Regards,

Support replied. There was no new winner request on the giveaway so most likely the giveaway was rerolled during site outage.

Nothing to see here, people. Move along.