Before Bitcoin was born, I participated in many ways to make money like PTC (Paid to click), PTU (Paid to upload) ... and HIYP. At that time, online payment services only had a few services like Paypal, PM, etc.
In all these forms, I think everyone knows HIYP is 100% fraud, but I still participate because HIYP carries a very high risk but it brings great profit in a short time.
Until now, HIYP is no longer as popular as it used to be, but it does not mean it disappears. Its forms will be more sophisticated.
With my experience, I don't want people to be adventurous, you can make a lot of money, but I'm sure it's just little money. You will realize that the money you lose will bigger than money you earn.
Sad, but it is indeed right and had been experiencing to join in a scam organization. I have been invested locally to a project where it advertises for buying, waiting and earn. It guarantee to give 80% profit and there are many proofs and other attest to it that they had receive their payout. For me, it was really shady of course so I risked huge money for one knowing that I could payout to it since it is still new. However, the outcome was different. The investment scheme scam was reported to authority which leads to losing all the investments of its users and the CEO had been nowhere to be found.