On the other hand: it is kind of crazy that when I read about "indexing the web" it starts ringing all kind of privacy bells, while apple's incentive might not even be to violate people's privacy.
If a company manages to upset Google then that company ceases to exists online, regardless of the validity of Google reason to blacklist that company. Ideally no search engine would be above 20% market share (20% being a random low number I just made up).
Right now websites and marketing material/money is directed at Google exclusively, making it continually harder for new search companies to succeed.
Google works well today, but what about 5 years from now, or 10 years from now? What if you need to be signed into Google+ to Google search? What if your Google+ account needs to be tied to a mobile phone? What if Google has limited search, and you need to own a Chromebook or Android device for the full search experience and viewing more than 10 results?
Competition keeps them in check from doing anything outrageous, and then if they decide to anyway, we have other choices we can migrate towards.