The whole point is the base OS they’re using which is not Android. Just another Android vendor has no choice and even successful companies can fall very deep in short time (see HTC).
You should learn that no all map data has the same quality throughout the world. Before Google bought additional datasets from the German government, Google’s Germany data was just crap compared to OSM (eg. in Google Maps a park had most paths missing and instead put an imaginary lake right in the middle). Even after Google got the more improved data, OSM is still better – at least the false lake is now gone: http://tools.geofabrik.de/mc/?mt0=mapnik&mt1=googlemap&lon=6.80592&lat=51.20264&zoom=16
