This is not correct. I think what you maybe referring to is an older dig by Brave and brave redditors when they noticed DDG were allowing MS trackers in specific cases.
DDG explained that it was difficult to resolve due to the way MS engages cross-site tracking but it has since been rectified.
Also, research has proven this was not some shady deal between MS and DDG.
https://www.reuters.com/article/factcheck-duckduckgo-gates-track-idUSL1N3792HE
Why are you lying? I literally shared a well-researched article disproving your statement.