I have a question for the community here. I have recently published four free courses on "Operations Research" totalling to 43 hours. Between 3rd January 2020 till 8th January 2020, (a time span of 4 days, considering that two courses were published on 6th Jan), I have about 1750 registrations.  I have however not a single review so far. What does it mean? Are people grabbing the course because it's free or is it that the time isn't ripe for receiving the first review? I am new to Udemy and would be thankful for a reply from you guys, who are veterans! Eventually I want to make the courses priced, may be after a few months.

Thanks