I don't understand why PONZI are allowed since later on they will rip off some people.
So why they'r allowed and related to gambling ? Because you are able to lose $ ?
Well you are able to lose
BTC or $ gambling anyway and the argument is is that they're both types of gambling and users know what they're getting into. I don't agree with them personally but people should be free to use them if they are willing to take the risk.