Zoom is really bad for this. On my old thinkpad there is a "mute" button on the keyboard. When you press it, it mutes the mic in windows sound settings and turn

Zoom is really bad for this. On my old thinkpad there is a "mute" button on the keyboard. When you press it, it mutes the mic in windows sound settings and turns an indicator light. I've had Zoom un-mute the mic itself with not notification to the user and the "mute" led even stayed on. In old version of Zoom, the host could unmute you without your consent and this would unmute the mic at the system level too. I resorted to disabling the microphone in the Device Manager so it would show up as unplugged instead. This also disables the popup other commentors mentioned. It looks like newer versions have unmute-consen which hopefully fix it, but the original behaviour made me feel uneasy and not trust Zoom.