[TeMPOraL]

There's indeed not enough housing supply to meet the total demand. There are various reasons for that, but that's the ground state. What AirBnB does is add to this an incentive for existing supply to further shift from serving city residents to serving tourists. Since housing supply isn't limited by low demand but by external and difficult to change factors, what AirBnB does is just making a bad situation much worse for cities worldwide.