For people that want to anonymously use Android...people using Graphene OS for example...it is endlessly useful. You get all the benefits of a mobile operating system without giving your private data to Google.
Organic Maps updates map data about once a month.
If you need help in editing - feel free to ask on https://community.openstreetmap.org/
(and bits of other sources like elevation data coming from elsewhere, but is primarily powered by OpenStreetMap data)