Of course, Google's service is to advertisers, first and foremost. Users generally do not pay for what they receive from Google. Perhaps Google's paying customers, advertisers, are the ones seeing the improvement in the quality of service as a direct or indirect result of telemetry.
Google Maps getting more precise telemetry data is actually so useful in improving the navigation experience in tricky intersections, overlapping roads, or low bandwidth areas where GPS signal and service can be spotty. I can speak from experience that friends with Android phones experience less jumpiness in their GPS location, less errors in navigation, and less of that pesky "You've Arrived" notification triggering when still far away from the destination.
Separately, I'm also a google customer as I run an Ad campaign for a small business (skilled labor), and the dollars spent on search ads are extremely efficient with an incredible ROI. Even with CACs in the 10s of dollars, with the size of the contracts being signed it typically costs much less than .5% of the total.
[1] Pretty much anything from Mozilla or Google, Reddit, lots of others.
There is no Apple Maps web page. With Google I can do a complex route plan on my PC and my phone will have the "recent searches" in it ready to go when I get in the car.
Apple Maps doesn't show how packed the trains are. Google Maps shows me how full individual train carriages are!
Apple Maps can't provide cycling directions in my area (a world city!), Google can.
Apple Maps routinely provides driving time estimates that are 2x longer or 2x shorter than the actual time. The Google maps estimation error is more like 5-10% instead of 100%!
Google Maps has a trustworthy "star" review score for local restaurants. Anything that's mid-4s or higher with over a hundred reviews is definitely worth going to. For a popular local cafe Apple maps shows the worthless Tripadvisor score with just 16 votes. Google shows its own data with 357 votes.
Etc...