I just got a Steam Key for the first time from the wheel of fortune. It popped up in the G.Giveaway tab as a "Your Gameplay Giveaway won". I clicked "Gift Link" which opened a new page that shows a "Secret Game" and a claim code button. When I copied the code and tried to activate it on my Steam...
The offer I made (Civilization IV: The Complete Edition) is a GOG key (not a Steam key). It expires on January 2, 2026.
I was going to comment this under the trade page but I can't. It seems to be something wrong with the site.