All the street data comes from OpenStreetMap.
OpenStreetMap is built by a community of mappers that contribute and maintain data about roads, trails, cafés, railway stations, and much more, all over the world.
OpenStreetMap’s community is diverse, passionate, and growing every day. Our contributors include enthusiast mappers, GIS professionals, engineers running the OSM servers, humanitarians mapping disaster-affected areas, and many more.
Some additional information is available in About the Node, Street, and City Data as well
So, basically, someone (potentially local, but not necessarily) noticed that some driveway/parking lot wasn’t mapped in OSM & added it. It sounds like the data they added to OSM was tagged in a way that makes it seem like a street.
If you provide links (either to CityStrides or OpenStreetMap), it’s possible that some members of this community can help you get things corrected.