Lots of people get scammed who think as you and put money into hyip and cloud mining sites getting greedy to earn passive income doing nothing. If you really want passive income better you learn to start, promote and maintain site in bitcoin nieche and earn from adnetworks,
People who are still investing and thinking that cloud mining and hyip's are one of the best way to steady income are newbies or else they really don't want to listen to the community and believe that all of those ponzi's are just a total scam. And with your suggestion of maintaining a site and earn from adnetworks is good but that is hard to do.