Cryptocurrency in general. Even on the surface, as presented, the main appeal to buy in is "to get rich from it" and the main way you're supposed to get rich is "other people buying in, get in early while you can."
Ponzi. Schemes. All of them. 
Cryptocurrency in general. Even on the surface, as presented, the main appeal to buy in is "to get rich from it" and the main way you're supposed to get rich is "other people buying in, get in early while you can."
Ponzi. Schemes. All of them. 