Thank you
I did find a list in a wiki-style site. Some of the sites where off line, and others as I searched for scams I always got some warning and scam reports. In fact, I have just googled for "cex.io scam" and I found a lot of negative comments

I don't know who/what to trust.
well I used cex.io for cloud mining first time it was profitable before stop their cloud mining service suddenly the rate was almost 0.I dont believe them they are really scam.about others don't have idea.