I wonder how the Tesla lease economics work out? Their lease is different than others in that you don't have th option to buy at the end of the lease--allegedly

I wonder how the Tesla lease economics work out? Their lease is different than others in that you don't have th option to buy at the end of the lease--allegedly the cars will be going to an upcoming taxi service. Anyway, if Tesla will be assuming all the mechanical/reliability risk/unknowns, does a lease work out better?