Crypto currency does not fit the standard definition of a 'ponzi sceme'. Ponzi scheme suggests an operator, individual or corp, which pays returns to investors from a capital inflow from the new investors. Who is this operator in case of crypto currency?
Arguments using facts and logical reasonings win the case. Saying subjective statements don't. Not to mention a cultist BTC believer will call everything FUD that doesn't support the "to the Moon" approach. So if you want any credibility here, destroy the argument (by facts and logic) and don't judge...
Investing in something that is decentralized has its advantages and disadvantages, each person is responsible for their actions. If tomorrow the bitcoin and together with them the other cryptocurrencies come to collapse, they will regret a lot. That's why it's better to go sold and bought. Always have the mind and atusance of a visionary, but so that you will invest.
Most of people that had lots of bitcoin by now should be selling There will probably be some millionaires out of this Let's just hope that when the BTC trend dies out, it doesn't take that much with it
Always here to serve Now, on complete seriousness... For as much as I can say by experience a bunch of people sold all of their BTC on it's first or second big drop (Before the whole craze started), I probably would have too, in their place, Nothing seemed to point that it would skyrocket like it did (But again everyone would be millionaire if it were that easy) (And I wasn't even really looking into it to begin with, so I can only talk in retrospective) Can't really tell why the people that kept them did so, but they saw something that i didn't so i respect them