Almost like Uber was marketed, AirBnB was not initially sold as a "make primary income off this". It was a way for people with excess assets (spare car and some time, spare room in a big house, etc) to make some money and the companies were the broker.
Turning Airbnb into a full-blown rental market with people and LLCs buying houses just for AirBnB was the downfall. At least, that's my interpretation.