Not worth it. It's not cheap maintaining a search engine. Apple could throw resources at it but what is the benefit? This is different than the Maps issue where Google refuse to provide new features for iPhone Maps. Apple used OpenStreetMaps (OSM) and created their own. By using OSM, it gave that project more visibility and others an alternative solution to Google Maps. A few years later Google suddenly makes it "not so free" for businesses displaying a map, they better put up a credit card.