FYI, Cody Coursework is here: https://www.mathworks.com/help/coursework/cody-coursework-for-instructors.html

Community is not limited to English-native people but widely open to people who mainly speak any languages. I create those problems since we had a request to have Japanese Cody questions. (This is a test phase yet, so please understand the situation.)

Currently, I add a tag for Japanese, but probably, we need a filtering feature like MATLAB Answers.

Everyone will have their own perspective, I'm sure. Personally I don't mind creation of non-English problems, because not everyone is (nor should be) fluent in English. Although I think it would be nice to have at least small differences to the existing problems. For example, if the original problem is to remove vowels, then you could create your own problem where the task is to instead remove consonants.