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"the proprietary data is not accessible outside their apps"

This is not true. Many APIs are available, specifically to allow building 3rd-party apps: Directions API, Distance Matrix API, Elevation API, Geocoding API, and so on. See https://developers.google.com/maps/pricing-and-plans/

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I think you'll agree that there's a big jump from being able to access an API X times a day to having access to a data dump.

There are specific clauses in Google's APIs that allow for things like disaster recovery applications to have unlimited access for free.

So I can download their entire map dataset and host my own copy?

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