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Personally, I have also fallen victim of it by investing in Ponzi scheme where I was promised very high return on a short period of time, but if I had good knowledge about Bitcoin investing then, I wouldn't fall to such victim, so for this very reason don't ask people to invest in Bitcoin for you, but learn about Bitcoin investing, and do your investment by yourself.
People will only understand how important it is to be informed and not be tempted by offers that seem too good when they become victims.. that's why, because so many people have already fallen victim, it's important for people to realize that no matter how convincing an offer may seem, they should always take the time to verify and always understand that managing Bitcoin investments is your own responsibility, not someone else's, and that there is no such thing as a guaranteed return.