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Friend was brainwashed by MLM-/ponzi investment scam. What can I do?
I don't want to repeat things that have already been said as I agree with most of them. There's just one little thing I'd like to add: If things go the way we're all expecting, this guy will eventually be in desperate need of a friend as he is extremely likely to lose most of his friends sooner or later. Perhaps all you can do is signal that you will not support him now (for obvious reasons), but that you'll be there for him when he may need you in the future...