And if Hotels close down due to AirBNBs there's more space for appartments where there once were hotels. If the AirBNBs take less space than the hotel they replace it's a win for appartments. If they cause more tourism it's a loss. What the overall effect is is far from clear, I haven't seen any thorough analysis on that.

It's naive to only look at one factor and ignore the others, yet that's often how far this debate goes.