Bitcoin is "neutral", so I do not agree nor disagree with the OP. If we use it as a Ponzi scheme, it can have some characteristics of it. 
One could say that Bitcoin sometimes works as a "decentralized Ponzi". There is no centralized party that profits from it, but multiple early adopters or "buy-low-sell-high"-speculators ... in this sense, the OP is correct. So don't be naive: Most of the bulls that are talking about a $1M Bitcoin are wanting to sell their coins to a greater fool. This is very similar to ponzis.
But ...
That is the idea. And thus, Bitcoin may have some Ponzi'esque characteristics, but it is not only a Ponzi.
Time will tell if we can break out of the speculative boom-bust-cycle which makes BTC appear like a Ponzi, or if we can make Bitcoin a real success as a currency. As of today, it is uncertain.
I want to quote from INVESTOPEDIA : "A Ponzi scheme is an investment fraud where clients are promised a large profit at little to no risk." Take note of the following:
- When we buy Bitcoin nobody is promising us large profit.
- Nobody says that when you invest on Bitcoin there is no risk. We all know that Bitcoin is a cryptocurrency which is volatile, so risk is involved.
Well, "nobody" is false, unfortunately. Before Google and Facebook banned cryptocurrency ads, I got a large amount of ads trying to get me into buying Bitcoin or $Altcoin, promising me to become a millionaire instantly.- When we buy Bitcoin nobody is promising us large profit.
- Nobody says that when you invest on Bitcoin there is no risk. We all know that Bitcoin is a cryptocurrency which is volatile, so risk is involved.
One could say that Bitcoin sometimes works as a "decentralized Ponzi". There is no centralized party that profits from it, but multiple early adopters or "buy-low-sell-high"-speculators ... in this sense, the OP is correct. So don't be naive: Most of the bulls that are talking about a $1M Bitcoin are wanting to sell their coins to a greater fool. This is very similar to ponzis.
But ...
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Second point, Bitcoin is a VALID Currency.
That is the idea. And thus, Bitcoin may have some Ponzi'esque characteristics, but it is not only a Ponzi.
Time will tell if we can break out of the speculative boom-bust-cycle which makes BTC appear like a Ponzi, or if we can make Bitcoin a real success as a currency. As of today, it is uncertain.
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Just my thoughts... Thanks
Idem.