[londons_explore]

OSM is used underlying a lot of commercial apps and services.

Most people don't realise that though, so they think their edits correcting roads will only get seen by a handful of open source geeks.

[alasdair_]

Agreed. For example Pokemon GO uses it - which is why there was a large influx of new users, prompting the following guidelines page: https://blog.openstreetmap.org/2016/12/30/tips-pokemon-go/