Simple action for those who are unhappy with this situation (and a suggestion for this website creator/ owner): hotels appear to be linked to their booking.com listing. Take a few minutes to select some hotels from the list (possibly at random), then go to their Booking.com page, search for reviews mentioning the lack of a bathroom door, and mark them as helpful. The website could agevolate this process by providing a list of direct link to booking.com pages of the offending hotels.