At some point I had DDG as a search engine and then I lost it and was unable to recover it, and I have two devices, both on CM13. Deleting appdata, reinstall -- nothing helps.
Now that I installed most recent alpha version I have a much larger list of engines offered and DDG is present <3
My current list of search engines offered is as follows:
Google, Yahoo, Bing, Ask, AOL, DDG