Gabriel Weinberg, an entrepreneur who previously launched Names Database, which is a now-defunct social network founded DuckDuckGo search engine in the year 2008 which was nearly 11 years ago now.
DuckDuckGo is a pretty popular search engine and gets nearly 500 million monthly visits so it's a good search engine to rank on besides google search.
I get a lot of search traffic from duckduckgo and even more than I do on google search and I never tried ranking my content on duckduckgo it just ranks my website content without having to do anything.
In fact I even found this website by searching for something on duckduckgo.com