> Google Search is leaps and bounds ahead beyond anything else.
Nothing is too big to fail. If there's no direct competitor, an indirect one or a group could take over too.
> Duckduckgo itself uses Bing Search as its backend.
This reads to me as if Bing was the only backend they use, which isn't the case. According to Wikipedia they use multiple backends:
"DuckDuckGo's results are a compilation of "over 400" sources, including Yahoo! Search BOSS, Wolfram Alpha, Bing, Yandex, its own Web crawler (the DuckDuckBot) and others. It also uses data from crowdsourced sites, including Wikipedia, to populate knowledge panel boxes to the right of the results.", source: https://en.wikipedia.org/wiki/DuckDuckGo#Overview