Personally, I don't care what's "efficient" and what will make Google the most money. What I care about is how they treat a) their users, and b) the planet.
Money is a means to an end. The fact that so much of our society treats it as their score in the game of life—something to be maximized at all costs as an end in itself—is a disease of the mind.
If Google (and, yes, literally every other major corporation) made more decisions based on what was better for their users (not just "their customers", because in certain aspects of their business that's advertisers, not regular users) and for the health of the planet, while simply making sure that they had a reasonably comfortable financial cushion, we would all be better off, and Google's executives and shareholders would barely notice the difference in their high scores.