No it's not. If anything it's a proxy for Bing, but that's one of many data sources[0] (another of which being DDG's own crawler[1]). I'm not aware of Google actually being one of those data sources; you might be thinking of StartPage, which is a proxy for Google.

[0]: https://duck.co/help/results/sources

[1]: https://duckduckgo.com/duckduckbot

They also have their own crawler https://duckduckgo.com/duckduckbot and additionally use several hundred "sources" for their results https://duck.co/help/results/sources with the main source seeming to be bing. I don't think google is one of these sources.

> DuckDuckGo is just a proxy for google

Bing, I thought?

I know that Startpage uses Google. And Searx uses Bing.

But I think that DuckDuckGo uses multiple sources. Although it's easy to restrict that to Google.

It's a lot more than "just" a proxy.