Perhaps the gravest risk is that the cracked installer or key generator is often a delivery vehicle for malware. Cybercriminals exploit the platform's trustworthiness to distribute malware-laden cracked software. This practice allows silent malware installation that can immediately begin stealing sensitive information.
JProfiler is a commercial Java profiling tool that requires a valid license key for use. It is not an open-source project, and legitimate license keys are not officially distributed on GitHub. How to Get a Valid JProfiler License
If you core-maintain a non-commercial, open-source project, you can apply for a free core developer license.