The other difference is that Google Maps has to build everything into the app directly. The privacy label for Apple Maps gets a 'free ride' on so many things by virtue of piggybacking on OS-level functionality.
Same thing applies to Messages vs. WhatsApp/Messenger and bunch of others.
For example, I personally would be outraged if they removed Timeline, which I rely on daily, but that feature alone probably adds a dozen privacy labels, even though it's optional.