DuckDuckGo Browser for Android merely wraps the system WebView (Chromium/Chrome).
It is not a standalone browser nor a fork of Gecko/Firefox/Fenix.
I also personally wouldn’t trust DuckDuckGo Browser after these shenanigans: https://github.com/duckduckgo/Android/issues/527
Please create another thread if you want to discuss this.
Or see this other related thread: Favourite browsers to use
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Aside, aren’t threads supposed to lock after 60 days?