In the rare event that a site gives you a functioning key, that key was likely purchased using stolen credit cards (known as fraud keys). Publishers like Rebellion Developments actively track fraudulent keys. If you activate a stolen key, Valve or Microsoft will revoke the game from your library and may permanently ban your account for violating their Terms of Service. How to Play Sniper Elite 5 Legally for Cheap (or Free)

: Activating keys sourced from stolen credit cards (often found on shady "grey market" sites) can lead to your entire Steam or Xbox account being suspended.

Here’s what actually happens when you click those links: