It used to use Google search results but they switched to Bing. It is worse than Google.
That’d be news to me and an ad hoc comparison I just did shows results much closer to Google than Bing with results usually just locally having switched places while on Bing it’s an entirely different order.
They do(did?) use Bing for mobile search results because daddy Google forced them to not be competitive on the platform they’re most interested in.