Possibly the point is that an individual can not be as easily tracked by first identifying the bus, however most cars are registered to their owners. Nowadays most buses and public transport are full of CCTV though so same problem really.
As a French, I find this quite funny because Renault tried for years not to sell their batteries but lease them (Zoe's mostly, which was the most sold EV in Europe for quite some time).
Tesla never offered the rental option for their batteries b/c they trusted their quality and reliability (Renault's batteries were and are quite subpar).