You can enter for some games like this one. I will want a reroll.

Hello hellalien.

Apparently there's a misunderstanding on how Steamgifts works. Let me elaborate:
This is a giveaway of a Steam package - not a singular game. A package like this typically includes the base game plus some DLCs.

Due to the nature of such packages, which are expanded offers sold via the base game's store page (or the store page of other parts of the package). As such, everyone can enter giveaways of such packages for a chance to complete parts of the set they are missing. Even those users who already own every single item that is part of the package.
There's something to consider though:
Giveaway creators are allowed to request a reroll if the winner already owns part of the package and you do own at least the base game. Additionally, the creator mentioned that they'd be willing to even provide the gift to users who only own the base game. They didn't have to do that, but they were nice enough to allow even that. That also requires you as the winner to allow to ensure themselves that you do have none of the DLCs.

So here are your options:

1. You keep finding this laughable and deny the giveaway creator access to that information and we are going to approve their request for a new winner
2. You add them on Steam as friend (which is needed only temporary of course) allowing them to check if you own more than just the base game or not.

Additionally, given your misunderstanding of how such giveaways work, I think it might be beneficial to take a moment to familiarize yourself with our FAQ and Guidelines.

Thank you.