"What about your previous post?"
As per the definition of a Ponzi scheme again:
One of the simplest yet most effective investment scams is the ponzi scheme. The promoter promises investors a return on investment and says it is secure, but there is no real 'investment'.
The promoter convinces people to invest with their scheme. They then use the money deposited by early investors to pay the first 'dividend' until investors feel comfortable and decide to invest more.
Source: Australian Securities and Investments Commission
Bitcoin provides no dividend to investors, its price is what the market says it is worth.
"Most people know they are buying facebook smiley for $15k and hoping they can sell it for $20k, while the ponzi scheme keeps going."
The example you describe isn't a ponzi scheme as per the above definition. Unless somebody promises you a return, it isn't a ponzi scheme.
