> What do you mean, leaked? Isn't this a FOSS project?
The client-app (CoMaps/Organic Maps) indeed is fully FLOSS. It uses OSM data, but that data is packaged into a specific and optimized format. The code _generating_ this optimized data (and serving it to the clients) was kept proprietary.
Please see my post above for details.
I guess the secrecy comes from that time.