Right now, they seem to be playing arbitrage with engineering talent. They buy up engineers with large salaries and fancy perks. Those people, who now span almost every industry, are then used on projects like these. This has nothing to do with Google's core business or any branch of it at all.
It seems like Google is designing all sorts of products outside of its core competency (medicine, cars, now this?) with the hopes of either spinning it off, selling to the highest bidder, or...? I can't see shareholders liking Google trying to enter every market in the world.