You have to activate the games you win and not trade them. You entered the giveaway => you are interested in the game, want to play it and should activate it on your account.
Somebody has paid for that game you won and you shouldn't be making profit out of this.
Also, If you don't activate it you will get banned.
Official site rules:
https://www.steamgifts.com/about/guidelines
https://www.steamgifts.com/about/faq
8 years ago
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Closed 8 years ago.
New Bundles
It's a gift game.