I really wanted cryptocurrency to work out. There is such a need for digital cash that lets people pay for things online without credit card companies charging exorbitant processing fees and then on top of that tracking every transaction and selling your purchase history to anyone willing pay. In addition to making existing purchases better, I thought cryptocurrency had a chance of becoming Clay Shirky's micropayments, enabling business models that can't exist now. Reading about far away lands (SV) where there were actually bitcoin ATMs in bars, it sounded like the future was almost on us.
Instead it turned out worse than credit cards or even paypal in every way. Your purchase history isn't anonymous. It is at best pseudonymous but easily traceable if you use it as widely as you you would a credit card, and thus effectively public unless you go to great lengths to obscure it. Processing fees are higher than credit cards. And it requires insane resources to operate that would make the most inefficient monopolist bureaucracy blush in embarrassment. It is completely useless as a normal day-to-day currency.
Then to make matters worse, it attracted a huge number of grifters, conmen, speculators, and criminals who are its only real users.
Etherium is at least trying to work towards being useful as a day-to-day payment method. It has been slow progress, and I don't know if they will ever get there, but at least there is some progress. Bitcoin though is failed experiment. It had it's run, and it is time to put it down.