I was in Google Patent Litigation, and there were tons of suits against Maps. In all of these, the plaintiff strains as hard as they can to find some connection to Ads, because that's where the money is. Maps doesn't bring in much money.
I'm not going to quote figures here. In some countries, they were paying someone per search for data, because they didn't have their own map data yet. Maybe that's changed.
"Oh, but imputed revenue!" you say? Well, no one has ever succeeded in defining that and proving it. You can be certain that Google won't ever do it, even internally, because that would end up in Discovery.