Earlier quoted context omitted.
I completely get you from a human level. From a business level google's job is to sell ads, it sell ads by providing valuable search results 'for free', and one part of the intrinsic quality of the search results is that they are 'good' in the sense that you describe. Aside from that google really doesnt owe anyone anything, if tomorrow google found that showing small businesses search results negatively affected the…
I'm speaking from a user level. If I'm a user and Google isn't showing me the best results, it's not doing its job for its users. If Google doesn't have users, its ad space isn't worth anything, and its business model ceases to exist. Google is the epitome of a consumer web business model. They sell users. So yes, they have to have buyers, but their most important job is to have users to sell.
> If Google doesn't have users, its ad space isn't worth anything, and its business model ceases to exist.
Yes but that is a second order effect. Basically the majority of "products" have to be convinced that Google is not good enough _and_ there is another alternative (I like DuckDuckGo for example), then as you say, people will stop using Google Search. Then if Gmail goes South, people stop using that. Then Android goes South, they start using iPhones. Eventually Google will provide a lower quality "product" to their customers and Google's stock will take a hit. However, don't be fooled into thinking you are Google's primary customer because you use them for search.