Good grief. Many moons ago I worked for the phone company. That was back when there was only one serving most of the US. Phone calls were routinely listened to for a variety of reasons. It was worth your job to repeat anything you heard, even to another employee. For one thing, we often KNEW the people we were listening to.
So I assumed nothing changed. I keep an echo next to my chair. When I am not going to be using it and coversing with others, I ‘hang it up’, i.e., I pull the power cord out. It’s not that difficult, people.