All the Bitcoins are useless. I did a transaction today in BTC and paid 2.50 in fees, it took 40 minutes. It's a ponzi scheme, not a store a value. You can't have a value stored in something useless.
Post the definition of "Ponzi". Then tell us who the operator is. Also, tell us who promised you anything. Also, who told you there is little risk?
Bye now
In 2017, it is pointless to argue with someone who claims Bitcoin is a Ponzi. Sympathize with him and help him to get a psychologist.