I can categorically tell all of us that, this days, any thing that has to do with Bitcoin, or any other cryptocurrency cloud mining, has a 99.99 percent of being a scam, and this simply means that, if you are the type of person that does try such mining platform, then you probably have been scammed over and over and over again, and if you haven't, then watch out closely, your next attempt may likely be a scam.
What am I saying in essence? It's simple, avoid cloud mining, for personally, I've come to believe that every one of them is a scam, even when they are paying, they still a scam waiting to happen.
I myself do not engage in such things as cloud mining, even if their ROI is as low as it can get for me to be convinced of their legitimacy, I still believe it's a lie and a scam.