The Nigerian Prince email scam went a little something like this:
You send his highness just a few hundred dollars in exchange for millions. You could trust him because he was a rich prince, but he had been displaced temporarily.
Well, it is basically the same scam but instead of dollars, they want Bitcoin.
With these scams, you send the money, they disappear. People are still hearing about these scams for the first time so they are still losing millions over this.