If I search DDG for "US President", the first results are the English Wikipedia page for "President of the United States" and "List of presidents of the united states"
If I search for "US-Präsident", I get "Liste der Präsidenten der Vereinigten Staaten" and "Präsident der Vereinigten Staaten - Wikipedia" from Germany wikipedia, and fairly high up is a link to zeit [0]
That Zeit link doesn't appear if I search in English.
It seems that DDG puts the language used of the search fairly high in the weighting. That's reasonable to me. If I search "Nicolas Sarkozy im Gefängnis", I get German stories about the French President.
I can see both arguments, I don't think differing weights for language is an indictment of a search algorithm specifically though.
[0] https://www.zeit.de/politik/ausland/2022-02/joe-biden-us-pra...
I also tried setting DDG to “All Regions” and the results were not better.