Money-making schemes are, generally speaking, a bad idea. Especially those that promise high returns on low investments, and Ponzi/pyramid schemes, and ones that sound a little too good to be true.
Yet people still fall for them. In a comment on a post by Ethan Vanderbuilt warning about the dangers of the ‘MMM Global’ scam, one person who has been taken in by it (scammee?) wrote a couple of paragraphs about how trustworthy it is, and how people should be using it instead of banks.