They genuinely don’t make sense as “currency”. Having a public, permanent ledger of all transactions is pretty bad. Buy groceries, pay your rent, and get paid in crypto? Now your landlord, employer, and grocer can see every transaction you’ve ever made, how much your account is worth, and how much you spend. Wonderful!

Sure, you could use a service to obfuscate your transactions, except oopsies, you’ve just reinvented centralization but worse! Wasn’t the whole purpose decentralization??

Cryptocurrency sucks because it genuinely doesn’t make sense at a fundamental level. That’s not even getting into the economic problems, like deflationary currency, or technical problems, like the exponential cost of hosting a node or the fact that it can only be scaled up to handle at most a teeny tiny fraction of a percent of transactions that a service like Visa handles every day.

What is actually a good currency? Cash.