Let's face it: the search results are not as accurate as Google.

Seems like ddg sends data to microsoft.
https://cyberguy.com/privacy/duckduckgo-privacy-browser-caught-sending-tracking-data-to-microsoft/
there is also a report by Rebel News.

Not exactly sure why this happened but running this addon caused youtube in non private windows to run really slowly to the point where I could only watch videos at 360p and as soon as I turned it off it went back to normal

It is absolutely an ESSENTIAL add-on. You should not crawl the internet without it.

Extension parfaite (tout petit bémol : empêche RMC BFM en direct de fonctionner)

Es el navegador que necesitaba privado y muy tranquilo.

Excelente experiencia, Gracias!