Can't see how you make it a ponzi.
Shitcoins being created for a quick money grab is a scam, sure. But not really a ponzi scheme.
Mostly we can see startups creating shittokens and easily escaping from the markets once the capitilisation is reached. Not we can doubt all of the cryptocurrencies but most of them including bitcoins, etherum, ripple, etc are been proven a better source of investment for long terms and also is being spreading the world much rapidly.
Well, crypto currency overall is not a ponzi or scam scheme, however they are few coins ICO / project which are made only to scam people and because of these people believe that overall crypto market is a scam.
In my understanding, good example for ponzi will be some HYIP program when owner paying old members with the money from new members and no services offered.
Bitcoin exist on the market and its price depends on supply and demand from real people.
So, I d on't see any ponzi here, really.
Well, there are many hyip programs in the market and all of them run on crypto, so again this is bringing bad name to crypto industry.