Sites which ask you for sending some bitcoins to get an interest are the total fraud. Never trust on bounty programs, I have recently submitted 2 articles for an ICO program which offered me $100 per post. Furthermore, Payment of my work was never received to me they claimed to pay me last month. Totally fraud
Investing in Cryptocurrencies was never profitable for me and especially for investing in an ICO you have to do a lot of research as there is a lot of fraud ICO’s on the web. In my opinion, to earn money online start a blog on Blockchain technology and earn bitcoin from a blockchain advertising network.
In addition, Here is the guide to start a blog – Click here