Google has plenty of low revenue, unprofitable products, some of which are social charities like Google Scholar. I don't think Mayer deserves as much credit as a visionary as you are suggesting. It was more about empire building after a sudden demotion and not paying increasing licensing costs to a third party vendor for turn-by-turn data. But I agree that the end result is a mapping platform that is far ahead of anyone else thanks to Google's significant investment and resources.
I don't expect Google to pull its map app from iOS because it is a very valuable demographic to collect data from and target. Also, Apple already has a large hole on its balance sheet trying to catch up to Google in mapping. It started around the time they very publicly fired Forstall for the whole iOS 6 maps fiasco.
True, one of the X projects like Glass would be a better direct comparison in terms of resources and headcount. Google Scholar was just the first thing that popped into my mind when thinking of a Google product that is a social charity. Which, of course, is not the right way to think about Maps since the ___location data they collect is probably some of the most valuable data for their ad targeting.
Let me try to describe Scholar from a different angle: Google relies on a lot of experts in their respective fields in order to be successful. And they need to stay close to the state of the art and current research. Google scholar is just the kind of database that helps with that. It makes sense to build it for internal use. And given that Google is also good at data analysis, it makes sense to open it up to the public and learn from the usage data. For example: What are hot topics? Which papers are read often in the community? This data can give an extra level of insight into what is going on in the research communities.
I don't expect Google to pull its map app from iOS because it is a very valuable demographic to collect data from and target. Also, Apple already has a large hole on its balance sheet trying to catch up to Google in mapping. It started around the time they very publicly fired Forstall for the whole iOS 6 maps fiasco.