Let winners reqest rerolls if key wasnt revealed yet

As long as there is some method to make the key completely invisible to the winner before it's revealed (eg. inspect element, I don't know how it works right now), so that when they press reroll, there's no way they'd see the key afterwards. I think it's not a bad idea, but it should be limited to giveaways when the number of entries is not small.

That minimises the chances a small group of friends keeps rerolling in a giveaway to bump up the creator's CV, say in the case where they wanted to gift a game to a specific person, and thought why not get some CV in the process. Right now it would take a lot longer and would be easier for moderators to figure out something weird is going on if the same gets rerolled 10 times.

"like for example someone may find the creator is an avid minority hater or lets say supports shelling of the civilians"
Man, that's the funniest sentence I have read today.

One example for a reason:
Let's assume someone create a public GA for 100 copies of a game.
The users enter and expect that the gifter have activated the automated sending of the keys, that is possible with 50 copies or more.
The winners experience that the keys aren't sended directly and that the gifter check the winners with sgtools + report the ones with infractions (unactivated wins etc.).
Some winners get then very unfriendly because they need to wait on the win, some want a reroll because "reasons", some come around with "oh i already have this game, sorry i didn't seen" etc..
In the end a part of the winners have infractions (unactivated wins), and if you look closer you see that this users enter very much of the 50+ copies GAs, because it is, nearly everytime, the case that gifters activated the "send this wins automaticly" possibility, which means the winners with infractions have a very tiny risk to get catched and reported.

[This example is a real example of how some gifters do their GAs and how some winners try to escape the incoming suspension -i, of course, don't reveal sg user names-]

If it would be possible for them to request a reroll, then a support member should do always a check for unactived wins and that would mean each reroll request would be double amount of work.

Besides the easy fact that it gave this suggestion multiple times and other ones answered a lot to it. More reasons too.

What does the giving / winning of a game have to do with your political opinion?
I'll make it easy on you - enjoy your blacklist.

Speaking from my experience "just contact the creator" is the answer.

"avid minority hater" - not sure what this is about.

"when someone blacklists you, you cant even comment on the giveaway anymore" - I remember a couple of cases in which winners created threads asking the community to comment in the giveaways on their behalf.

A gut feeling tells me that winners requesting the re-roll will lead to more confusion and work. Winners getting gifts on Steam, requesting the re-roll around the same time the gift is being send being first among the reasons. There is plenty of potential to abuse the system there, as some might want to keep their wins low.
Of course this might be prevented if only winners of key giveaways are able to request re-rolls.