Blitzer.de Pro App is the bestseller App in German Play Store. The Update now features OpenStreetMap Slippy Map to show crowdsourced speed cameras, constructions, road closures and traffic jams. The App even has an OpenStreetMap based Navigation System.
1 Million people in Germany can now see and use OpenStreetMap Data in their App. This is a huge success and a breakthrough for OpenStreetMap adaption.
Unfortunately the app does not mention the Copyright yet. Hopefully this will be fixed soon.
It’s not just unfortunate but illegal. Write to them, usually they just forget to add the text.
You can just link to the official attribution guideline, written by the foundation: https://osmfoundation.org/wiki/Licence/Attribution_Guidelines
I already contacted them, asked them to have a look on www.osm.org/copyright