Startpage web search uses google primarily and startpage mobile search uses bing primarily. That’s why the mobile search was down but not the web search.

‘Bing is our primary search provider for mobile.’ https://www.reddit.com/r/StartpageSearch/comments/1c9z8iq/comment/l0wdd1o/?utm_source=share&utm_medium=mweb3x&utm_name=mweb3xcss&utm_term=1&utm_content=share_button

‘For the time being, you could try using the desktop version on mobile and you should be able to get web results. Please note that you might still encounter issues with image results.’ https://www.reddit.com/r/StartpageSearch/comments/1cymb9k/comment/l5aibax/?utm_source=share&utm_medium=mweb3x&utm_name=mweb3xcss&utm_term=1&utm_content=share_button