That's a valid point. I thought the same thing but they could have the camera stay focused on the stage where the questions are being answered and not on the pilot with the question. There's many ways they could de-identify the pilot voice, asking people not to introduce themselves before the question (or editing that out) and/or changing the sound of people's voices. Moreover, asking a question in front of a large group isn't the best way of remaining anonymous if that's your priority.