That would be a pyrrhic victory at best. True ownership of comsumer devices is de facto a thing of the distant past. If you degraded sales to rentals by law, manufacturers would immediately try to jump onto that train and come up with ways to extract even more momey from customers. How would you feel for having to pay your CPU manufacturer for the actual CPU time spent on your personal desktop computer at home? Of course, each core counts separately. Can't have you pay less for running properly paralellized programs, now can we?