Basically we don't know the risk in every site if you invest money in a site first is you don't know if the site was trusted there are site that can give you small profit but many site are just scamming people who invested.
Just always keep on mine that there is a possibility to have a risk because in nature it is actually inevitable. But it is not a reason for us to not try rather it may be the reason for us to keep on trying because before to be successful we should take and do things that may gave us challenge in life. Yes it is a challenge yet is sure a worth one.