There are plenty of ways to generate passive income. There is cloud mining, icos, lending platforms, Amazon services and good old MLMs. If you have the time and you're willing to put in the work anybody can make it. Here is a link to get you started. And FYI capitalism is what allows residual and passive income to be viable options for revenue generation.
Thanks for the informations and response. However, I have already freebitcoin account. But, that is not enough :(
https://freebitco.in/?r=5518953 :)
Its a start. Once you build that up enough to withdraw you can use that bitcoin to feed other ventures, without compromising your regular income. Diversify, risk, invest and reinvest. Patience and dedication will pay off.