Can I remove a game from my library that i won here long time ago?

There isn't really a way to do it without being in violation of a rule, which is to have the game you won on your account.

Beyond that thought...

Kinda a dick move to remove a game someone gifted you though, don't you think? I know not everyone enjoys every game they get, but one need not throw it out if grandma buys you a copy of My Little Pony Monopoly, she gave that to you.

The first GA I ever won I wish I could remove lol.. it was for Drunk Wizards which was in a 19,900 key giveaway. There was a huge controversy at the time as well as there was a massive giveaway for this game on gleam and the dev revoked all the keys smh.

So yeah unfortunately you can't remove it from your library. Hiding it is about all you can do. I'm pretty sure a lot of those 19,900 SG members wish they could remove it as well.

You might want to buy a copy and give it to the GA creator and beg him to delete that GA so you are free to remove it. Kinda complicate but should work

Just create a new folder in your game library called trash.
Move the crap games there and minimize the folder.
And uninstall to save room of course.
Easy Peasy.

Actually, if you delete a game from your library you can buy again the same game, and that should give you another license. If you remove the game from your account, it's not there anymore, until you buy it again or restore it.

No it's permanently removed because in order to do it you have to use Steam support.

if giveaway creator was active here - he can ask him about deleting this giveaway, but.. its impossible ¯\_(ツ)_/¯

The person who made that giveaway is permanently banned ^_^
It seems like that person re-gifted 3 games that he won and he didn't activate GTAV he won either (guess he sold it lol).

The giveaway was almost 2 years ago as i mentioned and i just checked the details, but the creator meanwhile got suspended permanent. :/ Don't know what he did, but it means its impossible to ask him for doing anything here.

That sucks. There really should be some sort of exception allowing users to remove games that can't be played anymore.

Maybe a solution could be:
You must giveaway the game you won in order to delete it from your account. But not that specific key or gift you won! To prevent regifting, a keychecker algorythm needed to check your key wasn't included in any previous giveaway in the site.

So basically original giveaway creator gifted something for u, but u throw it into trash can, and give a different copy for somebody else. So as a result original giveaway creator happy to giveaway something and get his points for it, you happy to get rid what you not need, and a 3rd guy happy to won that game he want, steamgifts happy too, cause everybody happy. :)
Its just an idea, but i think it can work. (maybe with minor changes or rethinking, but something like this)

didn't you read what he wrote?

I use my hiding section to keep freeish games on my library, cause they not keep there. After an uninstall, they disappear.
But with hiding, they keep staying in my library even if i uninstall them. For example Trackmania Nations Forever, Eternal Senia etc.

Its still in your library.

It's like store your trash in your house forever, instead of let it carry away by a garbage truck.
But you're right, it looks like its the only thing I can do in this situation.

I don't get it, if you didn't receive it, why you clicked "received"?

and I still can't enter some SGtools locked giveaways because I still have not activated [Witcher 2]

Witcher 2 isn't what's flagging you.
It doesn't matter when you activate a game, both SG and SGT treat your account the same as if you'd activated it right away or years later. So long as you've got everything activated properly [now], there's no lingering "punishment" for any previous non-activations.