Almost every cloudmining site will disappear sooner or later. Don't invest serious money into this sites. You will regret it at some point !
Try to see it like this:
Why would someone let you rent his hardware to make money with - while he could just "produce" the money for himself.
That's definitely how it seems.
If a cloudmining project wants to gain people's trust, they should set up some smart contracts so the payments are automatic and the scripts are public. Otherwise, people would just be betting hundreds of dollars on their word.