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LLMs have a strong bias against use of African American English
(arstechnica.com)
This is a most excellent place for technology news and articles.
Yup, it's atypical even in the rest of the Americas. I think that the nearest equivalent in Portuguese would be the quilombola dialects, but even then it's way off - because those dialects are still geographically associated with their respective quilombos, not just with race.