there's no more passive income style investment in bitcoin
either they are scam or ponzi type of "investment"
you need more active on your investment, like buy account for signature campaign and earn more bitcoin after posting constructive things in this forum
For example, I've invested 0.5 CLAM in JD before, and then wait 2 month, and only get 10% extra as return. Adding the price increase of CLAM during that period (but it is also a risk), my total gain is 20-30% during then. The income may not even outweigh the price decrease of the coins (though it may increase like my case). Consider what you can lose, because when the site gone, you will lose all your money..