I will stop you there before you do something you will regret about it later . Stay safe and don't use them .

Scam alert about them : https://www.cryptocoinsnews.com/scam-alert-bitcoin-cloud-services/
Read this as well : https://bitcoinmagazine.com/articles/exclusive-possible-500000-bitcoin-cloud-mining-ponzi-scheme-uncovered-1433546738
and here is a topic about them : https://bitcointalk.org/index.php?topic=1010670.0