[aiiotnoodle]

It is done for cartographers in OpenStreetMap to map where they have been (or where others have been).

I use it to add metadata to my local area, things like business names, postboxes, benches, etc.

Mapillary is not a private cloud for your own personal Google Street Map. It's a public Google Street Map with appropriate licencing (open) for mappers to add data to OSM, using Google Street Map would be in violation of its licence.