I wonder how many perfectly usable/recyclable chips are abandoned in landfills worldwide.
This is largely because the cost of any individual component is so much less than the cost of a finished assembly, or the cost of a defective assembly. Inserting used components into your manufacturing process (unless they're very high value or rare parts), is asking for trouble.
These components need to be stored properly to be effectively assembled, and you'd never be sure of why the used one were thrown out. Especially as many types of damage or degradation would either require very substantial and specific testing rigs, or else be challenging to identify in the first place.
Putting them inside a vehicle isn't a viable option from an safety or economic perspective.
My understanding is that most of the cost of analog chips is the time in the testing machines to characterize and bin them. I assume the same is still somewhat true for CPUs, etc.
If you were somehow to acquire old CPUs that were up to the task in old modules, you'd have to remove them, clean up the leads or solder bumps, and then test/bin them before you could trust them enough to send to manufacture.
That astronomical price is obvious fantasy, but it's not too difficult as a task, it's that capitalism can't and won't care about the environment until after it's too late (which, it might already be).
As a species we need to stop this throw away culture.