You'd have to ask whoever mapped it as such, if you check the history of that item, you'll be able to see that changeset, and you can comment on it.

For private property, you'd tag it as access=private.
Driveways get mapped as people choose to, someone most likely was mapping the area and saw it on aerial imagery and drew it in.

I'm part of the Data Working Group as a volunteer moderator, however I commented on this outside of that role.