5; Ponzi scheme; Cryptocurrency is not a Ponzi scheme so we have to be very careful
Well, cryptocurrency that give a solution to a real problem, have no promised returns, are not primarily driven from a leader who's going to run away with the first deposits, aren't ICO-based, and are completely transparent aren't ponzi schemes. But, strangely, the crypto community is consisted mostly on ponzi, fraudulent, get-broke-quick schemes.
What about scamming the scammers?
Waste of energy.