Perhaps Tesla maintains ownership of it so that you never have to worry about whether someone you're swapping with is unloading a bad battery on you. At a certain degradation, they just give you a new one.
It's not even dead weight! Just extra battery capacity that's removable.
Standardize the form factor and turn it into a uniform standard that every manufacturer can adopt.
Perhaps Tesla maintains ownership of it so that you never have to worry about whether someone you're swapping with is unloading a bad battery on you. At a certain degradation, they just give you a new one.
It's not even dead weight! Just extra battery capacity that's removable.
Standardize the form factor and turn it into a uniform standard that every manufacturer can adopt.