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Friend was brainwashed by MLM-/ponzi investment scam. What can I do?
First, there are MLM businesses that are legitimate and are not Ponzi schemes; I actually work with one (I will not name it lest I give the impression of trying to sell here). One thing I learned was how to respond when a prospect raises objections related to the actual scams, which are abundant; the answer being to point out, and you mentioned this yourself, that in an illegitimate scheme, there is no actual product being offered - the only thing money is ever spent on is the expectation of a future profit. Ask your friend, "Would you buy the product this company sells, at the price they ask, if there were not a financial opportunity attached to it?" If not, "How can you expect anyone else to buy it from you?" There are only 3 ways he can respond to this question: he can realize that you're right and get out now; he can change the subject to the concept of making money by climbing the ranks and earning off of a salesforce, in which case it's time to educate him on Ponzi; or he can claim to be able to sell something he doesn't believe in, in which case you should run fat, far away. If he does indicate that he would be a customer even without the chance to sell the product, then offer him the chance to prove it, by giving you one sales pitch on the condition that he is not allowed to breathe a word about joining the business. Do him the courtesy of listening with an open mind, and decide for yourself whether you could ever be a customer. If the possibility exists, even if not today, he has found one of the few legitimate MLM companies, and you should not try to stop him. If not, you'll have to determine whether it's because the product just isn't for you, or because it's inherently worthless, and whether you should encourage or discourage your friend going forward.