Strangely, Airbnb has another problem that is the exact opposite. My wife started to book a unit, got to a point where it said she had 9 hours left to complete the booking, and then someone else booked it first. She was so angry because it seemed to clearly indicate that she had X time left to complete the booking. She messaged the host again to find out what happened; apparently this can only occur when instant booking is available (and the host cannot deny another potential guest in order to keep days open for a pending guest).

Having seen dark patterns described/decried on HN, I thought it was funny that Airbnb apparently has accidentally-light patterns.