They could easily buy Volkswagen sized company from the reserve cash they have and still have quite a good amount of reserve left. I don't think car experience is something that is the limiting factor.
Or let's bet 2% of valuation to create another high margin business in one of the only sector that could give us trillion dollar more. I am just saying that few 10s of billions are enough to get all the tradition car makers talent, so if they are serious about car this is not the blocker.
