tomtom on the Neo1973

[Hans L]

I just thought of another (yes, probably unlikely) possibility, but
maybe worth considering.  A map provider could keep their data in a
closed format and provide a closed source binary library API for
interfacing with the data.
This way open source developers could have their own front-end
interface, and possibly do some innovative and new things with the
data, while keeping the data format closed and somewhat protected.