what happens when the winner of a giveaway give no feedback?

oh sorry, i read it wrong. wait one week, then tell support so you can reroll your giveaway :D

You have to kill him, it's in the site's terms and conditions

Nothing happens, you just don't receive feedback and the missing feedback will haunt you till the user gives you feedback or you ask help from Support.

What happens when winner is on vacation and has no access to internet?

Send the person an Email, or comment on their Steam Profile Page. Friend invite, so you can chat and work it out. For me, i've emailed instructions and links to the "View Won" pages, to make it easier (For those that don't know how to)). Use google translate if they speak a different primary language. Anything that makes it easier for the winner, and polite/respectful.

If they have redeemed the game, and are clearly active on their Steam/Steamgifts account but are just not dealing with you "Receive confirmation", then after a week or two put in a support ticket.

Frogs rain from the sky and the oceans boil

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