Lower prices for recommended destinations, ads played during trip, LLM engages the customer.

earlier price is steep because they still have huge RnD cost but if we scale that to one planet, it would been cheaper in the long run

As I understand it, unless the fleet size dramatically increases, the cost of a ride is completely determined by supply/demand.

How long does it take to recoup the cost of the automobile and all the tech stuff they add to it?

As I understand it, whatever it costs, is strictly less than the market dynamics of providing the ride today.

There is probably some market equilibrium where they could reasonably provide <5 minute pickups for waymo users that would both cover the cost of the automobile and still be less than the price of an uber today.

You'd have to account for the billions of dollars has Google spent since the first Darpa Grand Challenge in 2004.