After Sniper Elite 5 launched on Steam, Rebellion implemented Denuvo anti-tamper, but also used Steam DRM for key activation. Gray market "exclusive" keys were often found to be from the Humble Bundle Choice (when SE5 was included months later). Resellers would claim them as "exclusive launch edition" when they were merely standard keys.
These stores buy keys directly from the publisher, Rebellion Developments. Purchases here directly support the creators and guarantee a working code. Epic Games Store Humble Store Green Man Gaming Gray Market Key Resellers sniper elite 5 license key exclusive