Nokia's Here offline navigation for Android no longer in "beta"

Despite being in "beta" for several months, and only becoming available on the Play Store in December, Nokia's Here maps and navigation has grown to be one of the best alternatives to Google Maps on Android. A big part of its popularity is due to including one-click region-wide downloadable offline maps, with turn-by-turn voice navigation, for free. Whether you are on a carrier with patchy coverage, use a cheaper cellular plan and depend on WiFi for data, or just want to be sure you'll get properly rerouted when you miss a turn in an area with little or no coverage, offline maps, points-of-interest and navigation can be a killer feature, which Google does not offer. When you do have data coverage, the Here app also offers reviews for restaurants and traffic information using Nokia's venerable own Navteq traffic information, similarly used by Google Maps and most other navigation services.
That doesn't mention the reason for the billing permission either.
The billing permission requirement was added on November 4, 2014, in this commit:
https://github.com/osmandapp/Osmand/commit/275ea7728cac21815c633af4722d0066f0fc273b
But the message on that commit only says "Add billing permission" and doesn't say one word about why. And it is a separate commit from whatever changes to the actual code were made that use the permission, so it is not at all easy to learn what it is for.