Security researchers frequently find that "unlocked" installers contain: Giving remote access to your system.

Software as a Service (SaaS) models, like Adobe Creative Cloud and Microsoft 365, do not use serial keys at all. They rely on continuous user account tokens. To secure older, perpetual-license software that was still vulnerable, parent companies issued a sweeping, cloud-side patch that blacklisted the legendary algorithm once and for all. What Happens When You Try to Use It Now?

Enabling heavy processing features that might be paywalled or hardware-locked. Enterprise Unified endpoint control or data encryption

The developer releases an update (v1.1, v2.0). The patch includes a blacklist of thousands of leaked keys. Suddenly, your "working" key fails. The software phones home, sees the ban, and locks you out. The key is now patched.

"Patched" versions often break when the software updates, requiring a new patch to be applied.