SCS Software has never officially endorsed unlockers. Their modding guidelines state that mods remain the property of their creators. However, SCS rarely enforces this unless a mod uses stolen licensed brands (e.g., a real Mercedes logo) without permission.

Many unlockers are trojans. Because the tools require admin privileges to run, they can install keyloggers, crypto miners, or ransomware. A "hot" new upload on a sketchy forum is a prime vector for malware distribution.

In short: