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.
True, you should conduct so much effort to search or found someone who know something regarding investing here, cause a lit of news spread through television, says bitcoin is a totally scam, so the responsibility will depend on the person who invest.