How @matrixdweller say "A ponzi is where people take THEIR OWN MONEY and give it to other people", if the people make some research will see that on steemit are a lot of people being rewarded just for post interesting and good content, i mean you don´t need to invest any money here to be sucessful, just smart and creative but Some people just think that steemit is too good to be true and then they say:
