The difference is that self driving cars are pretty close to coming to fruition. It's a pretty natural step to assume a car that can realize it's broken and hir

The difference is that self driving cars are pretty close to coming to fruition. It's a pretty natural step to assume a car that can realize it's broken and hire a mechanic to repair it. Houses aren't nearly that far along yet. And ownerless taxis don't need to be non-greedy. The algorithms that make the most money and are able to produce the most offspring (either by buying other cars or paying off a factory to build more) will probably help the economy the most. If the car is effective at making money, 1 car can eventually turn into 1000 with little human management. A non-greedy car might not be able to achieve that.