You are overly cynical. There is a group of developers sitting just a few feet from me whose whole job is making Google's products more accessible.
That said there are a lot of people at Google doing a lot of different things, and most don't think about accessibility until they have to. But, as a company, Google seems to take it seriously. And there is enough idealism built in to the culture that I don't think we need external people telling us we need to do it.