I made a video explaining why BitCoin is not a ponzi scheme. Unfortunately many people call it that way, and I decided to address that issue:
http://www.youtube.com/watch?v=KCaYBsrz4k4I hope my video is a contribution. Long live BitCoin.
I haven't seen the video.
However if someone thinks BitCoin is a Ponzi Scheme, then they do not know what a Ponzi is.
They may just think that BitCoin is a scam (Ponzi is a scam, however it is a certain type of scam).
Hopefully the video explains what a Ponzi is. Why BitCoin is not a Ponzi and a scam in general.