a better option is to invest directly, not through others. you can buy bitcoin with fiat. Keep it in your wallet and then wait until you see a profit. because the bitcoin is real and promising, not a scam.
There are people who says that bitcoin is scam. I can advise that you should research everything before you invest. You must aware and learn knowledge. There are some reason they are saying that bitcoin is scam because they dont even try bitcoin yet and they keep on giving negative comments.