Majority of Cryptocurrency scams come from cloud mining services. Most of the cloud mining platforms are not real, they are just impersonating under the umbrella of legit ones. About 70% of cloud mining networks are all scam, only few are legit. I have seen cloud mining platforms that promised to give users reward up to 120% of what they invested within the duration of one week. I wonder where such kind of money will come from to pay the user, when they deposit their hard earned coins via their platform. If you ask me, I will tell you to be careful through cloud mining platforms most of them are not what they claim to be. Make researches to ascertain the legit ones to invest your money with.