The Role of Signal in the Darknet Market

For signal of course it might be possible to tap into, we do not know because their application is distributed as a binary encrypted. As for the traditional surveillance capability, when you talk on WhatsApp or on signal the microphone on your device is busy. So if your phone is busy at the moment it's probably some kind of protection. Even if the call is encrypted the device is pwned and from there whoever is trying to tap into the phone at that point can hear the call or see the text right?