As much as an high-yielding investment program are all illegal activities they can not be totally eradicated because the online environment is a very vast and wide environment so it will be very difficult to regulate it.HYIP is illegal activity. I remember an announcement of Ad DOGE having his coinpayments and paypal closed for just performing ad pack on his PTC script that is one reason that HYIP owner is illegal activity in reality however his account won't closed.