Apple hasn't learned much from the Maps fiasco, have they? Also, Apple seems to be a lot more keen on hurting Google than on providing the best experience to their users. They did that with Maps, when they decided they'd rather give the users a poorer maps experience, than continue dealing with Google, and if Google refuses to pay this much, then they will do it with search, too.
Thats really only half the story. Apple couldn't give their customers the experience they wanted to give them: Turn by Turn, no data mining, etc... while staying with Google. So they made the decision to go their own way.
Hindsight being 20/20 they should've stayed with the "subpar" google maps until their new maps were less "subpar". It's great to point out hindsight but it's hard to fault their logic that they needed to move away from Google Maps. The only thing to really nail them for is doing so before apple Maps were fully baked.
I think the difference here is that Maps probably loses Google money, or doesn't make them very much. If this is the case, why should the pay Apple to be featured? Search is a different story, as this is where Google makes their money.
I'd imagine most people here (myself included) have a much better impression of DDG than they do of Bing, but I doubt that the average user would. If anything, they'd probably be _more_ turned off by DDG than Bing ("At least I've heard of Bing").