Their app size problem is because of an unusual development constraint: they need the user to be able to move halfway across the planet and still have the app w

Their app size problem is because of an unusual development constraint: they need the user to be able to move halfway across the planet and still have the app work without downloading any new resources. All the UI needs to be preloaded so that, say, if you travel from Rio to Toyko or Cape Town to Jakarta, you get off the plane and can hail a cab on even the flakiest of connections.