When I presented arguments like the one in the the video below, people just ignored them. Now, they will learn the hard way what it means to be a part of a Ponzi scheme.
Bitcoin And Cryptocurrencies - Ponzi Schemes Dressed Up And Sold As Money
https://youtu.be/gcNngl8fCUY
EDIT:Why bitcoin is a Ponzi scheme:In a banking system all money comes from debt. So when new money, dollars for e.g., are created, in the same time, some individual, company, or organization became legally obligated to pay these dollars back. That's the nature of debt - it must be paid. In other words, every dollar that is currently in circulation, must eventually be returned to FED or commercial banks. That means that those who received dollar loans and put dollars into circulation are forced to get these dollars back by selling their goods or services to people who have dollars. Otherwise they will fail to make necessary loan payments and as a result they will be taken to court and the banks will seize their property.
So due to the fact that dollars come from debt and debt must be paid, people who have dollars do not have just a piece of paper with some numbers on it, but instead, they have legally enforceable rights to goods or services of people who received the loans. Fiat is therefore a legal instrument that grants its holder with legal path to restore the intrinsic value in some economic goods.
Cryptocurrencies on the other hand, didn't originated from debt, so nobody is legally obligated to use them to repay the debt, which is why cryptocurrency holders have nothing but empty numbers. And if a situation occurs where nobody wants to accept cryptocurrencies in exchange for goods and services, no legally enforceable right exist upon which they can get some kind of value out of them. Hence, all that these people have is hope and faith that someone will exchange their numbers for fiat money or economic goods, which is by definition a Ponzi scheme.
Why cryptocurrencies never were and never can be money: cryptocurrencies don't have value on their own and as such they cannot serve as a measure of value.
A measure of value is pretty simple concept. It expresses the value of one thing in terms of another. In principle anything that has value on its own can serve as a measure of value. For example a toothpick. Although the intrinsic value of a toothpick is very small it is not zero since toothpick has practical utility. So perhaps the iPhone is worth 500,000 toothpicks. A shirt may be worth 25,000 toothpicks. One hour of guitar lesson may be worth 15,000 toothpicks. And so on. Since it has value on its own toothpick acts as a measure of value and we can use it to compare the value of different goods and services. The same is true for fiat currencies. Since fiat currencies are legal claims connected to property of borrowers through loan contracts we can easily measure how many units of newly created money corresponds to a particular good, service, claim or other asset. This legal connection to property is the reason why fiat currencies can be used as a measurement of value. This is also the reason why the exchange rates of fiat currencies maintain relatively stable and have low volatility. It is precisely because these currencies are legally connected to real property and real tangible goods.
On the other hand, in the case of cryptocurrencies, besides having zero intrinsic value they are not legally connected to property. In other words there are no enforceable contracts or collateral behind them. There is no legal claim that is measured with them. There is no right which is granted to their holders. All there is, is open source software which generates stores and transfers empty numbers between members. Given the fact that number is an abstract mathematical object thet has no value on its own it is impossible in principle for cryptocurrencies to serve as a measurement of value. This is the reason why crypto currencies never were and never can be money. Also this is the reason why their price is so volatile unstable and can jump from few cents to several thousand dollars. Since they have zero intrinsic value and no legal connection to property their price depends entirely on the number of people that enter into the scheme.