They will respond to feedback about such roads not being suitable for general traffic.
If you are in the US the data problem is likely an artifact of TIGER which has hundreds or thousands of miles of roads that are given a single generic class which ends up being pretty unreliable outside of developed areas.
Even in the Bay Area, it's not hard to get GMaps to try to e.g. route you through a park, a fire road, a private road (the type with HOAs and nasty signs about how they'll prosecute you if you try to drive down their precious street).
If you are in the US the data problem is likely an artifact of TIGER which has hundreds or thousands of miles of roads that are given a single generic class which ends up being pretty unreliable outside of developed areas.