After a stay at an AirBnB, I provided a review. A part of the review question was "What would you suggest as room for improvement?. AirBnB told me they will keep this answer confidential. In a few hours, I had multiple passive aggressive messages from the host about the "confidential" feedback.
Are you sure it said confidential? As far as I know Airbnb has always had a field for “A private note for the owner”. This is “confidential” between you and the owner, as in “not public”, but not between you and Airbnb.
I mean, likely AirBnB did relay the information confidentially... but doesn't take a genius to figure out which guest suddenly provided the confidential feedback which was sent on the day after your stay ending.