Had the same thought. Don't know what data iRobot collects, but perhaps its telemetry includes square footage of your rooms / house? (Amazon can use that to determine how wealthy you are). Attach an echo on that with microphone and camera, and the iRobot could even sneakily follow you and spy on you - Alexa always with you in your house, anywhere!

With Alexa, there is a manual hardware switch where you can turn off the microphones. With Echo Show, there is a manual hardware shutter for the camera.

I'm not sure if that is the answer to privacy concerns, but at least it is there.