My brother has always insisted Tesla uses Google maps. He points to the "Google" note in the lower-right corner and considers that proof. However they are VERY different.
* Tesla maps have different information, different presentation, etc.
* Tesla maps have different data. E.g. T maps are full of errors, G maps very few. Recently there was a road change near my house, and Google figured it out and updated the routes within a month. Tesla displayed the old (wrong) data for over 6 months.
* During the change above, Tesla gave impossible directions, e.g. "turn here" at the top of a 50' tall overpass, like it expected you to jump off. It continued to invent impossible route variations until I drove out of the area. Google doesn't do that, ever.
There are other differences, but I don't see how they could be using Google data. Even the route data doesn't match Google. Mapbox/etc makes more sense.