The official DroidCam client provides a robust free tier, making cracks largely unnecessary:

The free version of the DroidCam Client allows you to use your phone as a webcam with standard definition video and no time limits. It supports both Wi-Fi and USB connections. 2. DroidCamX (Pro Version)

The most significant selling point of the Pro version is the removal of resolution restrictions. The free version limits you to 640x480 (480p), which looks grainy on modern monitors. The Pro version unlocks 1080p Full HD (and 4K on supported devices). The difference is night and day; the image is crisp, professional, and holds up well under Zoom or Teams calls.