There are varous policies, e.g. https://support.udemy.com/hc/en-us/articles/229605848-Q-A-Rules-and-Guidelines and https://support.udemy.com/hc/en-us/articles/229232927-Course-Material-Price-Rules-and-Guidelines and https://support.udemy.com/hc/en-us/articles/229605728-Co-Instructor-Relationships-Rules-and-Guidelines and
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