Before searching for a crack, try Graillon 2 (Free Edition) or MAutoPitch . These are legitimate, free plugins that provide high-quality real-time pitch correction.
Send MIDI from your DAW’s chord track or a MIDI keyboard. Real-Time Tune will follow the played notes exclusively. Result: even wild melodic runs stay perfectly tuned.
To answer your search query definitively: Cracks are worse in every measurable metric: stability, latency, CPU efficiency, and security.
The most common mistake is ignoring the key. If your plugin is set to Chromatic, it may pull your notes to the wrong semi-tone, creating a messy sound.