I'm not sure if I correctly get your point: DDG provides search results based on Bing and has advertisment contracts with MS but DDG in itself doesn't track you:
From DDGs FAQ:
We partner with many different information sources to deliver DuckDuckGo Search (e.g., Microsoft for ads, Apple for maps, etc.). When you view search results (including ads), your searches cannot be tied back to you, either by us or our partners. How this works technically is we do not store any personal identifiers (e.g., IP address) with your search terms, and we also proxy all requests to partners through us.