This is getting kinda off-topic but I'm not really sure "illegal activities" is particularly high on the reasons to use or not use a given GPS/mapping app.I’m not worried about tracking that much. I go to work and come home. Not involved in illegal activities.
Google tracking, like pretty much everything Google does, is about knowing everything about you, so they can show you more closely targeted ads. Then again, maybe the lawyers do care about that "frequents drug-den neighbourhood" metric, so who knows, perhaps likely illegal activity is something they make a guess about too.