This is an excellent follow-up to the AirBNB story posted here earlier.

Tl;dr AirBNB ruled that a host's photo with an easily-glanced-over single camera tucked in a corner was sufficient evidence and documentation of the fact that they had multiple cameras inside - i.e. that the guest should've been aware that there was no expectation of privacy. The article mentioned unplugging said equipment, other comments mentioned guests having found cameras in alarm clocks in AirBnBs, etc.