When I have a need for real-time traffic on Android app I prefer Magic Earth, who has a decent privacy policy. But can they be trusted? No idea.
However, if you want truly private, real-time traffic navigation, I suppose the only option is an old-school, dedicated device like a Garmin.
But unless you disguise your vehicle, cover your plates, put your toll transponder in a Faraday bag, disable your vehicle’s telematics, and are able to confirm you have not been tagged with a hidden GPS transponder, it is next to impossible to travel in your personal vehicle anywhere in the U.S. without being tracked in some way by the powers that be.