A high-yield investment program (HYIP) is a type of Ponzi scheme, an investment method that promises high return on investment by paying previous investors with the money invested by new investors.
Investing in HYIP programs is basically gambling. Therefore, it is not safe. A HYIP can at any moment stop paying its users. The admins of these programs are almost invisible. They use fake contact information, proxy servers, fake IDs and VPN programs to hide their true identity. When you lose your money on a HYIP scam it will be an almost impossible task to track them down.
That being said, it is still possible to make money by investing in HYIP programs. The trick is to join a HYIP programs that are new but gaining popularity. There are a lot of ways to determine if a HYIP is going to be popular.
Investing in HYIP programs is in a lot of countries not legal. However, the chances of being convicted for HYIP investments are very small since it is too much of an effort for law enforces to find out about it.