The best argument against cryptocurrencies is their impact on the environment, which is becoming huge and is based on solid numbers.
Thousands of thousands of hardware miners in pretty much every country, and growing every damn day, each one drawing no less than 3 Kilowatts 24/7 and pumping heat into the atmosphere don't come without a cost. Which for those who don't care about the environment is also represented by the unprecedented raise of energy prices.
Energy has become the raw material used to build money; its costs follow the demand and will continue to soar as long as prices continue to be dictated by the demand for continuously growing crypto farms. There's no going back until some form of strong regulation, or a global catastrophe, will end this for good.
My personal (admittedly Don Quixotesque) stance on the matter is that I will never ever accept to be paid in crypto currency for products, services or whatever: their value over here is less than zero.
My personal (admittedly Don Quixotesque) stance on the matter is that I will never ever accept to be paid in crypto currency for products, services or whatever: their value over here is less than zero.