I assume this is referring to 'improving.duckduckgo.com'.
I don't know what it's for, but I've noticed it too. Disabled by my default uMatrix rules, (more generally by virtue of being third-party) and I never have to enable it for a working site.
This is a sample of what I see some of the time [1] similar to what you said.
I've also seen it more than this too at other times. Always from following DDG links onto destinations like this, but at other times what looks more like a google tracker.
These anonymous requests actually fire from the search engine and are not related to or embedded in other websites at all, so I suspect the tool you are using is erroneously attributing them. People commented about that in the above threads, e.g., https://news.ycombinator.com/item?id=30742751
I'm not very familiar with umatrix though none others come to mind, and in any case all requests to duckduckgo.com domains are anonymous by design since (as that article notes in more detail) we have our web servers and related applications set up to not log any IP addresses or other unique identifiers with requests. If you want to DM me on Twitter though I can look into it more.
I just looked at umatrix, and yes, those look like completely anonymous requests to improving.duckduckgo.com that are being erroneously attributed to originating from that page when in fact they originated from the anonymous search results.
So what's the implication, that DDG is deceiving its users through tracking scripts? Wouldn't this also require buy-in from individual websites to include the DDG script?
Any amount of details would be useful to evaluate your claim.
I asked about qwant once and Europeans chimed in with the opinion that its results suck. Ddg isn't a terrible browser or engine, less shady than brave IMO.