Cloud Mining

Hello Miners,
I always try to introduce you cloud mining websites to you but at this post I want to warn you about cloud mining websites.
Maybe most of you know cloud mining is a little bit different from mining. Most of the cloud mining websites have ponzi system, which is always finally stuck, so if you want to invest at Cloud Mining Website, I suggest you to check it very carefully because I have seen a lot of scam sites.
Roi over 6 months is a long term for me, but roi in a short time is not trustable.
So please be very careful.
Regards...