DuckDuckGo is a mirage and should not be used by privacy-conscious folks. Take a look at its terms of service, information collected section: "We also save searches, but again, not in a personally identifiable way, as we do not store IP addresses or unique User agent strings. We use aggregate, non-personal search data to improve things like misspellings." So they save your web searches and claim that they do so in an…
Do you have a search engine that you prefer to use that claims not to store said information that I might try?
Every centralized search engine has immensely hard-to-resist and powerful incentives to play "The Eye of Sauron" with your data. Additionally, they offer single points of compromise to other, far more powerful actors. Whatever guarantees DuckDuckGo gives you -and right now they don't give any- don't mean much, if they've been thoroughly (willingly or unwillingly) compromised.
Which doesn't mean one should always steer well clear just that one should at least be aware of the tradeoffs one makes when using a centralized search engine. And with DuckDuckGo's misleading marketing, I feel that this point is lost on significant chunks of its userbase.