First, I’m not sure how much they would be concerned about privacy issues of only a single person over a year. They uniquely identify individuals over multiple sessions. I think they also wouldn’t need to know the specific identity (“John Doe”) and could just use their anonymized id (a unique individual whose name we don’t know).

Also, even if they choose to not do this for maps even though they do it for lots of other things, merely aggregate traffic info on roads would be useful. 364 days of zero traffic and one day with 30 minutes of one car would be useful.