Airbnb makes that matchmaking easier (on both parties), and in exchange takes a 9-15% cut.
Property owners who used to be forced to choose between offering 1-year lease or trying to piece together some mid-term rentals (and suffer vacancies in-between) now have an additional choice: take ~85% of the much higher daily rate people are willing to pay.
I agree it's perhaps made that specific pattern of consumption more expensive, but IMO, it's done that by making the overall market more efficient.