It is very risky to invest via Web, everywhere are scam sites, also of course cloud mining. As special exception, I can make you 10% profit in one week without any problem, but only from 1 - 2 BTC and up 
There is definitely a risk and we should not be afraid of the risk, because if we are afraid we will not get a good enough profit from the funds we have. Indeed the site web-based investment scam for sure, but if we don't capitalize on this in a few moments only..??