> people who used it to get rich quick by running these Ponzi schemes
The problem with any new currency is that unless an entire government forces it on people, there's no real reason for anyone to use it. Think about it: what use is a currency that no bank will store, no business will accept as payment, and nobody else has ever heard of?
There needs to be some incentive to "get the ball rolling". Bitcoin relied on using an artificially imposed cap on the total coins to force the currency to be deflationary, rewarding early adopters. The earlier you get it, and the more you commit, the more you are rewarded. This gets things moving, hopefully to the point where it becomes a real currency.
The hiccup with this is that it turns any currency utilising this mechanism into a giant Ponzi scheme. It's a inherent trait of deflationary currencies, and no amount of arguing will ever make that not be true. Rewarding the early adopters with the cash deposited by later adopters is the point! It's not some accidental side-effect that can be swept under the rug. It's also the literal textbook definition of a Ponzi scheme.
Other people saw that there was $$$ to be made, so this concept has been copied into virtually all cryptocurrencies. What would be the point of some SV startup of 10 pimply kids making a currency that didn't reward early adopters? Nobody would give a shit, not even their own friends and relatives. But if there's that sweet early-adopter profits to be made? Suddenly billionaires will dump a few million in and profit.
This is just the nature of the entire ecosystem now, and arguments against are either hopeless naive, or a waste of everyone's time.
The only way crypto can ever be legitimised is not "organically", like it is now, but by the actions of large organisations. If a bunch of banks got together to make "Terran Credits" based on a blockchain, without the deflationary aspect, that would work, perhaps used for centuries... but nobody could "get rich quick" off it, so it wouldn't be an exciting web 3.0 opportunity. It would just be... money.
Oh, and of course, the corollary is that if big banks or some governments got together to make "Earth Bux" or whatever, you can bet it would have all the same rules and restrictions around it that there are now around holding gold, USD, or whatever.
Wherever you are, the government will continue to impose their will upon you, one way or another.