But truth to be told, DDG is so handy with the shebang keywords, I search Google using it and only leave DDG in my Firefox search bar and specialize with !g !gv !gi as needed.
github? !gh
wikipedia? !w
youtube? !yt
google? !g
images? !i
and there are tons of them!!
EDIT: on that point. It would be very neat but probably very difficult to build a search index based on a agreed upon algorithm like bitcoin. There would be a need for some sort of voting system to update the algorithm and moderate people gaming it.
Apple's businessmodel is based on selling real products.
Apple knows my web browsing behavior because Safari is my default mobile browser app syncing my history, reading list and bookmarks with desktop Safari.
Apple knows where I work, live and my travels via Apple Maps and Passbook
Apple knows a few of my purchases via ApplePay both in the real world transactions and via ApplePay in apps.
I used MobileMe mail before switching to GMail and have considered switching to iCloud mail.
Apple knows a lot more interesting things about me than Google.
Google makes 90% of their revenue from advertising.
Apple makes <5% of their revenue from App Store sales.
I could be wrong, but I think Apple might have an ideological problem with a lot of content. It's their call if they decide to filter that stuff out, but it's censorship, and I struggle to see how that would result in a "better" search engine.
EDIT: Applebot still has uses beyond a search engine though. I think Apple are being straightforward in it's explanation. It's for Siri and Spotlight.
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.