@mikey@friendsofdesoto.social @aires@tiggi.es It's using Bing now, along with some other search engines:

https://www.startpage.com/privacy-please/startpage-articles/enhanced-search-results-on-startpage

In working with Microsoft, Startpage is now incorporating Microsoft Bing search results and ads within some results pages, using a custom-built private search solution. Google search results will continue to broadly be used, but incorporating additional high-quality sources will have ongoing returns for our users.