A Ponzi scheme is a form of fraud that lures investors and pays profits to earlier investors with funds from more recent investors. The scheme leads victims to believe that profits are coming from product sales or other means, and they remain unaware that other investors are the source of funds. This is what a Ponzi scheme is. Bitcoin isn't a ponzi scheme because it doesn't do that.

If you believe that bitcoin is a ponzi, then A) it should have been corrupted by now and B) you should believe that stocks, gold and other assets are all ponzis, because they neither do what a ponzi scheme does.

So yes, you either don't know what is bitcoin or ponzi or both.