Or let any third party [view a photo | talk to you on the phone | listen to a voice memo ] with everybody else in the room. We already have answers to those "wo

Or let any third party [view a photo | talk to you on the phone | listen to a voice memo ] with everybody else in the room. We already have answers to those "worth it" questions, largely. The more important question is whether a third party can use that data to cause you harm, and if that's a concern, I'm afraid the only real solution is to limit your ability to be included in that data.