The premise I think is that you're "sharing" the ownership of the car with your neighbors and fellow users. So instead of a model where each person owns their o

The premise I think is that you're "sharing" the ownership of the car with your neighbors and fellow users. So instead of a model where each person owns their own car, these cars are "shared" between various drivers. Presumably there's an implied distinction between this model, where people share ownership of their primary car, and the typical rental car model, where people are presumed to be traveling or otherwise renting the car to supplement their existing car ownership. Not saying it's some brilliant insight, but there is an internal logic to the use of the term.