Where did you hear this? This isn't true. If you want google without the tracking, use StartPage (if you're using DDG this can be accessed with the !sp bang preface)
DDG uses Bing as their fallback engine but also does a lot of propitiatory indexing of its own
https://duckduckgo.com/duckduckgo-help-pages/results/sources/
The simple solution is to change it to a BSD license and call it BLIMP