AirbNB is getting away with very grey legal area here, they should he held legally accountable for facilitating illegal rentals. Right now my tax dollars are paying for the government to enforce what AirBnB sells without impunity.
On a personal note I'm thinking of pursuing this legally with AirBnB and/or my city, my street has 4 illegal AirBnB rentals on it and my city can't see to enforce their own laws. There's enough interest in my region to easily get about 30 people on board, and that's just one semi small town.
And we don't blame the users of AirBnB, they dont know the local laws, we blame the landlords and ultimately the platform.
I know in west coast tourism destinations you will practically get beat up if your renting out to airBnB illegally since it has such a negative effect on local housing prices.