DDG uses other search engines for results (such as bing), so unless you agree Bing is improving, it’s just a placebo.
DDG is only useful because we can all fall back on g!. It’s sad but true. There is still no substitution for Google search.
This doesn't prove anything. Unless you can provide some metric to say it's not good, then it's delusion getting the better of you.
DuckDuckGo is good enough for everyday usage, for me. It has been this way for well over a year. I never use bangs.
The one place it's really currently lacking is in rejection of spam sites.
DDG is so good that I use GOOG maybe once a year as a secondary search engine. And I started with GS since it had a comically-terrible interface in 2000. I switched because they went evil and DDG was more than good enough being privacy-focused. The !bang searches are a big innovation and timesaver that sealed the deal.