Sure, we all have seen them,,, but there is no cure against them. Just like any scam like Nigerian Prince or Ponzi or HYIP,,, they will be around forever and it is just on us to learn lessons of others and remember, if it sounds too good to be true,,, it is too good to be true.
There is no cure. Only prevention.
Indeed, and the only ways to prevent any probability of being part of this ponzi schemes it to avoid anyone of them. We can stop them actually, just like what the other people said here but with proper knowledge and information from different reliable sources we will able to have resistance over these fraud people handling over scam projects.