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every stock IPO that doesn't pay a dividend is a ponzi schemeI agree with you in spirit. Stocks that will never pay a dividend (if you can see the future) are worth $0. Most stocks are effectively speculative assets.
The difference is that a stock has a real, legal value: ownership of a company that has cashflows. If that company is liquidated, you have rights as a shareholder. You may also be able to vote on important decisions that the company makes.
Bitcoin is an asset that, by definition, never will pay a dividend. It is a stock that we know with certainty is worth $0. Its only value is speculative.
In that sense, Bitcoin is very much like fiat currency: its value is imaginary and based on how other people value it.
But if we're comparing Bitcoin and, say, USD, then Bitcoin is by far the worse currency because it's deflationary and unbelievably expensive to transact.
That's why, in places with unstable currencies, people mostly shelter their money in USD. If cryptocurrencies factor into it, it's because those currencies are seen as easier ways to transact USD. People who need their assets to be spendable on a daily basis don't hold them in Bitcoin.