Qwant, Ecosia, and (to an extent) DDG share the same Bing backend for web results, so if you're particularly interested in trying out alternatives, here are some others. All of these have their own search indexes.

https://yippy.com - ugly, but probably the best independent search engine outside the "big ones" and DDG

https://private.sh/ - Run by PIA as a proxy for Gigablast, small index but rapidly getting better

https://mojeek.com - UK-based, worth trying but has a spam problem

https://beta.cliqz.com - German based, their technical blog has been posted frequently on HN. Will eventually require a browser extension or their own browser to search.

https://yandex.com - Ought to be mentioned, but certainly not privacy focused.

https://beta.cliqz.com/ is currently available as any other webpage, and will continue to be available in the same way in the future. I think what's being referred to is another search product (search as you type) we have in the Cliqz Browser. I work on these.

The blog referred to: https://0x65.dev/

I'd love to see a write up about the differences between all these. "Find one you like" makes it seem like a good search engine is more subjective than it is. It would be cool if these companies collaborate and shared their indexing strategies, algorithms, etc to make the whole alternate search engine space better in general.