Germans were more vassalized post-WW2 and have therefore a higher adoption of english than e.g, the french. Another consequence of the marshal plan is that yankee’s wanted Germany as a consumer market and hence german culture is more closely tied to yankee culture than other countries, a lot of our shows, books, movies, music etc. are translations from english. So there is more in common to talk about. Add to that there are a lot more germans than finns or dutch and I think it makes sense that german is the most endemic non-english language on lemmy.