This is called a HYIP, high yield investment program.

https://steemit.com/bitcoin/@jimbojones/hyip-high-yeild-investment-programs-what-are-they

Something i invested into accidentally, not yet knowing too much about the various bitcoin website systems.

https://steemit.com/bitcoin/@jimbojones/amazing-bit-haul-investments-started-3-days-ago-get-in-now

You can indeed make money.. but most of these are ponzi schemes.

I am currently testing these systems.. out of about 20 sites.. 3 are actually paying me.

Most took in a payment.. let me take out one payment.. and as soon as i put in more money they stopped paying out.

I would avoid HYIPS ;)