What happen If someone win 2 giveaways for the same game?

The world ends.

They ask one of the gifters to get a reroll instead of accepting the win.

You contact one of the two gifters that you don't need the game anymore and he/she should reroll for a new winner

Take one of the copies,and ask the second person to request for a reroll.

Combines them into one supergame to end all others?

happened to me before and at the exact same time. What a coincidence lol

just ask one to reroll

The universe blows up

Winner does nothing. Gifter asks for reroll.

I wonder how often this has happened.

You accept one of them, make sure you actually get it, and then you ask for the other giveaway's owner to re-roll for another winner.