qutebrowser is a web browser for Linux, Windows, and macOS operating systems with vim-style key bindings and a minimal GUI.
 It is keyboard-driven and is inspired by similar software such as Vimperator and dwb.
 It uses DuckDuckGo as the default search engine.
 Qutebrowser is included in the native repositories of Linux distributions such as Fedora and Arch Linux.
DuckDuckGo (DDG) is an Internet search engine that emphasizes protecting searchers' privacy and avoiding the filter bubble of personalized search results.
 DuckDuckGo distinguishes itself from other search engines by not profiling its users and by deliberately showing all users the same search results for a given search term.
 DuckDuckGo emphasizes returning the best results, rather than the most results, and generates those results from over 400 individual sources, including key crowdsourced sites such as Wikipedia, and other search engines like Bing, Yahoo!, Yandex, and Yummly.

Question: Why does Qutebrowser use DuckDuckGo ?
Answer: emphasizes returning the best results