The conditions would be that all the controls that are in place to prevent it from happening are bypassed, which no one has proven yet. For example, Apple has developed their devices (assuming not jailbroken) in such a way where the camera and microphone usage indicators are hardwired and can’t easily be bypassed by software hacks. So if your phone was listening to you all the time, then the microphone indicator light would always be on. Listening 24/7 would also drain the phone’s battery and use up so much data it would be noticeable. Another example is Siri. It is actually designed in a way where there are 2 components. The first one is local on the phone and separate from the actual Siri component. It is what’s actively listening for you to call it. Once you call it, it then activates the actual Siri that transmits your voice inputs online.
Did you have to do any special configuration, or was it a seamless installation just like a non-mac laptop?