"The women are playing soccer."
Translation:Die Frauen spielen Fußball.
Duolingo uses American English fairly consistently.
It usually accepts British English equivalents but displays only American. So the "German for English speakers" course is written in American English; there's no "...for British English speakers" course specifically on Duolingo.
So seeing "yet more americanisms" should not come as a surprise to anyone.
I'd love to know the figures, that is, percentages of learners from USA compared to from non-USA. With Germany being in Europe, I'd hazard a guess that there are a lot more Europeans (and therefore speakers of British English, with whatever mother tongue) that want to learn German than folks from thousands of miles away who will almost certainly never even visit a German speaking country. Do we have stats? I don't remember if we were asked at the outset. With Spanish, different story, obviously.