His Kafka course https://www.udemy.com/course/apache-kafka/ is highly rated and AWS courses get good feedback. A lot of effort gone in to the production and is knowledgeable on the topics.
Given the Kafka course has 56,023 registered students alone even at the lowest offer price minus Udemy fee's he's done alright out of it.
Sometimes authors give away a course for free for a few days and post on places like Reddit. This helps them to get the initial mass and ratings. So we can't always assume that all registered students have paid for the course. I have taken a few free courses like these when I saw them on reddit.
His Kafka course https://www.udemy.com/course/apache-kafka/ is highly rated and AWS courses get good feedback. A lot of effort gone in to the production and is knowledgeable on the topics.
Given the Kafka course has 56,023 registered students alone even at the lowest offer price minus Udemy fee's he's done alright out of it.