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Friend was brainwashed by MLM-/ponzi investment scam. What can I do?
Even though this is really a psychology question, I'll try to give you an answer. You do nothing but stay away.  What's going on is too small to matter. Bernie Madoff took investor's money and scammed them for $15B. That's B, billion, 9 zeros (Yes, I realize the UK Billion has 12, these are US Billion). Harry Markopolos was on to him, and presented his evidence to the government, but "No one would listen." In quotes because that's the title of the book he published on his experience. Even Barron's had an article suggesting that Madoff's returns were impossible. Eventually, it came to light. In my own experience, there was a mortgage acceleration product called "Money Merge Account." It claimed to help you pay off your mortgage in a fraction of the time "with no change to your budget." For two years or so, I was obsessed with exposing this scam, and wrote articles, nearly every week discussing every aspect of this product. Funny how even though mortgages are math that's pretty easy to explain, few sellers wanted to talk about the math. Using the same logic that you don't need to understand how a car works as long as you know how to drive. There were some people that would write to tell me I saved them the $3500 cost of that product, but mostly I argued with sellers who dismissed every word I wrote as if the math were incomprehensible to anyone but the software guys who wrote it. In the end, I had compiled a PDF with over 60 pages of my writing on the topic, and decided to call it quits. The product was recycled and now is sold as "Worth Unlimited," but the software is the same.  This is all a tangent to your problem. It simply offers the fact that the big scam, Bernie, continued for a long time, and people who were otherwise intelligent, fell for his promises, and didn't want to believe otherwise. The mortgage software had many bloggers writing. Searching on the web found a lot of discussion, very easy to find.  People will believe what they wish. Tell an Atheist that God exists, or a believer that He doesn't, and your words will fall on deaf ears. Unfortunately, this is no different.