Most of the time they don't leave feedbacks which is a shame. At least you would be able to show your side of the story. To be honest I wouldn't let students leave reply without feedbacks. I remember one guy left a feedback on my course saying "Good" and gave a two star rating. Stupid. But there is another reason I think people may give bad reviews at the start and this is the constant popups for students to leave reply. I contacted about this Udemy earlier. I think it's just stupid to ask students for a feedback after watching only a couple of videos.
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