Hi @ValentynaDerv, totally understand that finding your hard work being available for free download is really frustrating. I really wish this wasn't the case, but sadly, online content is often pirated, even HBO and Netflix shows.
The best thing to do when you find something like this is to submit a takedown request with our partner Link-Busters who can act on your behalf to request that your course is removed from these sites.
Link-Busters typically successfully gets the Google Search result removed so it's harder for people to find these pirate sites and download your course. Unfortunately, it's harder to ensure that the actual pirate sites remove your course because they tend to ignore DMCA requests.