A very unhappy woman learned Expedia does not refund bookings that are cancelled by the hotel due to overbooking. I've used Expedia but always book hotels that provide a refund if cancelled within 24 hours of check-in. I don't know what would happen if the hotel cancelled my reservation but I'm definitely going to check before I book through Expedia.

https://www.yahoo.com/gma/isnt-woman-speaks-her-hotel-reservation-cancelled-no-121505120--abc-news-travel.html