Hey there, Caine from DuckDuckGo here. I understand why you might think this, but it's a myth.
We are significantly more than that at this point, including that we've been working on our own web index for the past two years (https://insideduckduckgo.substack.com/p/duck-tales-why-duckd...). But on top of that we don't get local results, knowledge graph, answers, sports, anything AI related, and many more essential modules from Bing, all of which collectively makes up a large % of the results at this point, let alone the vastly different UXs.
Since you're here, can you comment on the problem of SEO spam and what DDG is doing about it? Just today I was looking for instructions on how to replace the cushions on my headphones. I typed into DDG the query "instructions to replace bose headphone pads" and it came up with pages and pages of links to SEO slop. The link to the actual Bose website containing accurate instructions was near the bottom of the second page of results.