After reading this article, I signed into my account. I found that even though I turned off tracking in Google years ago, it still kept my old history.
The article says that Google turned on auto-delete for new accounts by default as the result of a lawsuit. However, if your Google account is older than x years, then they still keep all of your location history unless you go in and manually choose to delete it. Even then, I no longer trust that Google will actually delete it.
Microsoft and Mapbox also have an experimental project where computer vision on cars maps the location of recognized objects. This is probably true of every company researching self-driving cars.
The article says that Google turned on auto-delete for new accounts by default as the result of a lawsuit. However, if your Google account is older than x years, then they still keep all of your location history unless you go in and manually choose to delete it. Even then, I no longer trust that Google will actually delete it.