I totally see your point. On the other hand: airbnb isn´t really the cheapest solution in many cases. We´re often pretty late with our reservations and so it´s often the last possibility to get an accomondation at all, because everything is already booked out :) In this case I also tried to get an "official" b&b farm or something like that, but no chance at all.
But I´m with you, there actually needs to be some kind of regulation, because some cities really suffer from this platform.