https://consumerist.com/2017/09/25/apple-switching-from-bing-to-google-search-results-for-siri-spotlight-queries/

The next time you ask Siri a question or look for something using Apple’s Spotlight feature, the web results you see will be from Google search, instead of Bing.

Apple confirmed today to TechCrunch that Google will now be the default provider of its web searches for Siri, Search inside iOS results, and Spotlight on the Mac. If you’re using Siri to search for images, however, you’ll still see Bing results.