OP what you just said is true  that double your money scam is really another major issue we are facing today in Nigeria. Let me add some more insight on how they do this thing base on what I was told and how we can protect ourselves.

Many people fall for scams like this due to the fact that they are looking for quick gain no doubt  which doesn't make any sense. First of all, when an individual is approached with such an offer ask yourself, in this our country dem still dey see  free money ?which is not possible That's what you should say to yourself, because everything comes with a price once you fall for such all you have is pain and regrets.

While some individuals might still fall for it, after paying a specific amount of funds to the scammers, the scammers might find a way to convince them to just leave it that it will grow. You might even see your money increase and then the scammer will approach you and tell you to keep investing. Because of the money you have  seen, the individual will send more money again. But when it reaches the time to withdraw, it becomes a problem. That's when most realize that it's a scam, but it's too late.

My advise is that it's good to always stay informed about everything, and when approached with such an offer and you know nothing about it find someone with knowledge about all these internet scams to confirm it, so you wont fall victim to it.