Why does the orange dot persist after quitting Zoom on macOS?

I've noticed that macOS (Monterey) is showing an orange dot in the status bar that is attributed to Zoom. I understand that this is a new security and privacy feature in macOS indicating that an application is accessing the microphone. When I quit Zoom, however, the orange dot persists. I'm wondering if Zoom, or a related service, is still running in the background after the application quit. I've checked the Activity monitor and did not see Zoom listed or anything obviously associated with Zoom. Why does the orange dot persist after quitting Zoom on macOS?