DuckDuckGo is horrendous for spam and malware distribution. I have stopped recommending it to non-technical people because they can't recognize the obviously evil/bad-pattern sites that are on the first page of many DDG searches I do
User manuals for stereo systems, specs for old hardware. Anything that can be generically referenced, maybe a bit harder to find. Someone can throw up a webpage that SEO's on "manual" or "user guide" and when I type in "Sony DTH-345 user guide" I'll see results like "manualsonline.xyz" that are clearly bogus.
I can't lab it up now, but that is the gist. And DDG has it while Google rarely has the same level of it.
That's my understanding. And while I appreciate that Bing is the "baseline", I would be interested in what it would take for them to do additional cleanup on results. Blacklisting domains should be a no-brainer. "Safe search" for suspicious sites, not adult theme.