With OP's exact same arguments one could also call gold a Ponzi
So --> bullshit
Fiat money is a Ponzi: fiat money is created from thin air when somebody takes out a loan. Newly created loans are beneficial to the receiver of the loan, while everyone else (those who already hold fiat money, as savings or future salary paymnents etc.) suffers. Everyone elses purchasing power drops a little bit due to the new money brought into circulation.
The newly created dollars or whatever, dilute the already existing money.
So fiat is a pyramid game where those who take out loans, dilute the existing money supply, but benefit from the loan. In many cases the loan is then even used to enslave someone else! Example: mortgage for rental property.
Bitcoin is different because mining requires real work, Bitcoins are not created from thin air, and their supply is limited, very similar to natural resources like gold or silver.
DEBT BASED MONEY IS HIGHLY CRIMINAL AND JUST AS BAD AS SLAVERY!