Airbnb's business is the app that connects property owners to renters. Their app is the technology, their marginal costs are 0- you can add another property to the website trivially. Their value is in the network effects in their app just like facebook. Wework actually sign rental contracts and take on the risk of not being able to fill the properties.
A big difference is that AirBnB (and Uber, Lyft, etc...) don’t own or lease any of the underlying assets (apartments, cars) but are purely middlemen.
We work could have existed with an army of secretaries taking phonecalls and it would have cost less