TL;DR I also had a trip cancelled, the host said she wanted to see a photo of me... I sent her this but then she went ahead and cancelled anyway. She wrote a vague review trying to imply some reasons for the cancellation but it was obvious she wanted to cancel for some other reason that she didn't want people to know. She wanted me to checking at 7am and lectured me that her place was not good for me anyway(?!). Now I have that weird review of a non-existant trip in my profile forever. I assume she wanted to post a reason for cancelling in short notice to not appear unreliable. Like someone pointed out before, it's just a bad memory to have someone being dishonest and cancel my trip. I don't want it in my trip list and I don't want to have a public review about me from a non-existant trip...
My point is:
I see no need to be reminded about a trip that never actually happened (Nor for the public to be able to see info about it).