I rented an expensive apartment in Paris through Trip Advisor with a "refundable" deposit of 1336 Euros. Several weeks later (several months before rental dates), I wanted to change the dates by one day, and could not. The deposit policy provided that I could get my deposit refunded minus the booking fee if I paid the entire amount due prior to cancellation and prior to September 1, 2022. Without giving me a chance to do this or try to change my dates back to the original ones, Trip Advisor cancelled my reservation and told me that I would not get a refund until the owner re-rented the apartment!!! This is a plain violation of the refund rules which do not condition the refund on someone else taking the apartment.
