Earlier quoted context omitted.
Nope. Maps is a huge differentiator. Search & Youtube is not. Windows and Android phones have good maps, iOS doesn't. No one will care much if the search is switched to bing or if youtube was not available as an app. Also youtube makes it money via ads which it shows in the latest app. I don't think google is monetizing maps much.
I agree YouTube may not be, but search is pretty big. However, Google would have a hard time blocking google.com from iPhone users without being anticompetitive. They can not expend the effort to create a google maps app for iphone, but that's not the same as being actively anticompetitive as they would have to be if they wanted to block search from iPhone users.
Similarly for youtube, google wants the widest audience. Wider the audience, more the ads and more money.
If apple switches from google to bing for safari default, apple gets to spite google a bit and google may lose quite a bit of traffic. This hurts Google. Google will never want to block iOS users from search or youtube.
Secondly, neither is a competitive advantage in smartphone markets. No one is going to switch platforms for either search or youtube.
Maps on the other hand, does not have much advertising. The previous app did not have any advertising at all. They got location data from it but they can get that from android phones. Google loses nothing if they don't release an app. If they don't release an app, it is a great advantage for android. So they have a tradeoff to make, whether to maintain that competitive advantage or release a maps app and gain some audience. If I were google, I wouldn't release maps. For the first time ever, android is way way ahead of iOS in one of the core features.