Well worth it. Highly recommend these tools to play the dumb interviewing game.
I’ve interviewed people who wore an earpiece and were fed instructions on the fly, and also people who kept their cameras turned off to try and hide the fact they were getting assistance. You started picking up on patterns like them repeating your questions, or spending a lot of time in silence (asking their friend a question) without any other communication or activity on the screen. Like they weren’t there.
I once interviewed someone who was on a call with someone but messed up their audio feed. I could hear the third person but the person I interviewed could not.