Like you might notice now, they are already gone. And I really have to disagree that you have to try them to check if they are a scam. I wrote an article (in German however) about it a week ago how to detect that this is obviously a scam. In short: 1. Check the profits, they are so unrealistic, that there is no opportunity of being real. 2. Check who is behind. If you google for the CEOs picture, you notice its a generic picture from a image agency that is used in other scam projects already 3. Just bitcoin as payment and a strong referal system is an alerting factor for a scam as well.

If you refer these sites, you help lurking people into a trap and possible even participate in illegal activities in most countries. Even if its not illegal in your country, you very likely risk your reputation against others. So if you go for it, don't advertise it.

Genesis Mining is something completely different as they are operating in normal parameters and if you compare them with aurora mining, you might notice they are way more expansive. They don't make sense as investment however as its often very high risk with little gain and you have to bet on a growing market. If you do this, its however a better option to just buy the coins now to gain from the growth.