If I can see them, they can see me. No need to walk onto anyone's property, the whole point (for me at least) is to map things that surveil public spaces

It's more casual than surveying e.g. addresses that may be hard to see if the building is recessed, but you'd still want to capture it because someone will want to route there sooner or later. Not so for cameras that only capture own property

StreetComplete has a "things" overlay that makes it very quick to add these at the position of a front door