Bing is no longer the default search service used by Siri on iOS and Spotlight in macOS. Apple has moved to Google search as the go-to service.
"Switching to Google as the web search provider for Siri, Search within iOS and Spotlight on Mac will allow these services to have a consistent web search experience with the default in Safari,” Apple told TechCrunch in a statement.
This means that if Siri does not have the answer to a user's query, then the system with just pull up Google results.
Investment firm Bernstein estimates Google currently pays Apple around $3bn for this deal, based on the fact Google paid around $1bn for the same deal in 2014 according to The Telegraph.
Source: TechCrunch