Almost all the cloud mining firms are scam! I read somewhere on the internet that "95% of the cloud mining companies are scam" that means few are very real and that one that are real don't even give good interest. I have a friend that used his refer links to bring huge investment to a cloud mining firm in Asia and about five months they were paying 10% interest monthly then the unfortunate happen and today the firm close every contact with him and he is now currently in debt. I don't think there is much different between Ponzi scheme and cloud mining investment.