reasons to avoid:
https://en.wikipedia.org/wiki/Cliqz
“Cliqz is majority-owned by Hubert Burda Media. In August 2016, Mozilla, developer of Firefox, made a minority investment in Cliqz. Cliqz plans to eventually monetize the software through a program known as Cliqz Offers, which will deliver sponsored offers to users based on their interests and browsing history. However, these recommendations will be processed locally based on a remote repository of offers, with no personally identifiable data sent to remote servers. On 15 February 2017, Cliqz International GmbH, a wholly owned subsidiary of Cliqz GmbH, acquired the privacy-oriented browser extension Ghostery.”
https://en.wikipedia.org/wiki/Hubert_Burda_Media
The company rose to some prominence in Nazi Germany, where it benefited from “Aryanization” of Jewish property under the leadership of the founder’s son Franz Burda and specialized in printing maps for the Wehrmacht. Franz Burda was a member of the Nazi Party and an avid Antisemite. In 1986, the corporate group was divided up between Franz, Frieder and Hubert Burda…
look yourself
here their github page:
https://github.com/cliqz-oss