Because it is not on Steam, any website claiming "Vintage Story SteamUnlocked" or "Vintage Story Steam key" is immediately fraudulent. There are no Steam keys for this game. There is no Steam library integration. Searching for "SteamUnlocked" for this title suggests that the pirated version is mislabeled, often by hackers who repackage the game incorrectly.
Searching for might seem like a quick way to jump into the wilderness, but it often leads to a buggy, outdated, and potentially unsafe experience. Given that the game isn't even on the Steam store, these downloads are particularly unreliable. vintage story steamunlocked
Why risk a virus for a game that gives you a free demo? Because it is not on Steam, any website