I have the same issue, just found out that my courses (and many of other udemy courses) are being published for free on this web site. I published this course last month, one person bought the course and few hours later made a refund... now it is on that website, actually it was published in the same day of the first purchase. If people "watch" the entire content of a course, they shouldn't be able to ask for refunds. You don't go to a restaurant, buy the food, eat the food and then ask for a refund.
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