You hear good things about it because they give good referral bonus for people who bring in new money. I dont think they are scam but i see every investor in Cloud mining as either a scammer or fool.
Cloud mining is waste of time and less profitable method. People either dont know it or knew it and still luring people in for referral bonus. The only way to earn a lot of money in cloud mining is to bring more people in it and get 10 percent of the new joinee's money as bonus.
I am yet to see a person who earned actual profit in cloud mining. What does that means?
BTC jumped from 1000 to 13.2k by end of 2017.
If you would have bought 1 btc and held it for an year, your end of year profit is $12,200. I am yet to see proof that hashflare during 2017 who got 1220% profit without referral bonus.
If someone made 5x by mining btc using hashflare, they actually didnt made any profit. They lost a potantial profit of 7X. Buying the coin will always give more return than putting money in cloudmining to mine the same coin.