This thing by eMarketer is not even close to "the % of iOS users use Apple Maps".Apple, despite having a great install base is not the defacto for maps. I was actually surprised at how small the % of iOS users use Apple Maps since I thought they had greatly improved (and because it's native)
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https://www.emarketer.com/Article/Apple-Looks-Drones-Upgrade-Maps/1014811?platform=hootsuite
I think Apple has shared this data once or twice, maybe during some Maps API workshops, and it's more like Apple Maps 70% vs Google Maps 30%.