I would rather use a native map Activity than a webview, e.g. react-native-mapbox-gl/maps which uses the Mapbox Maps SDK for iOS and Android. The problem with this though is 2 fold. A Mapbox account token has to be configured in the SDK and horror of horrors the SDK sends telemetry back to the Mapbox service.
So my question is are there any open source map libraries that I could use instead of a webview or Mapbox SDK?