Like any get-rich-quick scheme, bitcoin scams thrive on the gullibility of its victims. Just because it's a digital currency doesn't mean you can acquire wealth quickly.
If you see a person or a group of people offering you a too good to be true, you know what does it means. Do some research before engaging in any investment platform because this might risky and you will loss lots of money from it. I have seen plenty of people scammed by an MLM ( multi-level marketing) scheme, wherein you need to invite people and encourage them to invest in their scheme. This is not how bitcoin or other digital currency works, BTC is not a scam, it is being used as a tool by abusive people to scam other people.