To understand the risks, you need to know the mechanism. Civ 6 uses standard platform DRM. Here is how a typical Steam unlocker functions:
Civilization VI receives periodic updates (even in 2024, the Leader Pass got patches). Every update restores the original DLLs, meaning you must reapply the unlocker—and wait for the unlocker developer to release a new compatible version. This cycle is exhausting. civ 6 dlc unlocker work