didnt mean you took it, someone else stole the real dev's game impersonating dev and uploaded it to steam to make money of devs work, https://i.gyazo.com/642837f50f41956a2e203172867cd83f.png
thus once potential legal or community action occur etc the game can get removed from steam and thus your winner even after activating key can lose it when the stolen goods are confiscated. This curator keeps list of games at risk
https://store.steampowered.com/curator/31857481-Games-at-risk-of-removal/?appid=2578530