Google's job is to portray the World as it is, not a desired fictional version. How would people even be motivated to change the status quo if it's hidden from them?
Any search-ad revenue Google gets is a side-effect of users going to Google for good quality search results. Worse results would lead to fewer users, fewer ads sold, less revenue.
The ad money is in fact a major motivation to provide top quality search at all costs.
I did the Noogler training too. What you said might have been true before "google it" became the verb people use for "search".