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Because they have elected to teach that variant of English. If you try to learn English from Portuguese you'll see this comment (https://www.duolingo.com/course/en/pt/Learn-English-Online):
Spoken by over 750 million people, English is the second most spoken language in the world (after Mandarin), and the most commonly learned. On Duolingo, you'll learn American English, but you'll be understood in any English-speaking country.
I'm British and very few of my Britishisms are rejected and I only wince occasionally when I read Duolingo's English sentences. :-)