As for releasing in bathrooms, or toilets as we would call them in the UK, most of them would not be big enough or hygienic enough for me to do that happily. However if there is a table or space on the way to the toilets I will sometimes use this as it would be a popular passing place.
That's my thoughts. I have never left one in a toilet (room), but the book I mentioned I picked up in one was in a spacious enough space to be a bit away from the actual toilet, and the frame along the wall was like shelving. The campers had been using it as such to leave books. Even then I hesitated to take the book, but after examination I decided to.
But I left a book in a bathroom once - a room with a bath, (in a private house as a joke).