Each Bitcoin transaction uses 4,200 gallons of water — enough to fill a swimming pool — and could potentially cause freshwater shortages

Bitcoin is the first in a huge series of crap for speculation, but it's not the whole thing. A good example is several central banks that are creating their own cryptocurrencies, centralized and generally fundamentally opposed to that.

How did you manage to twist a truism into a fallacy? You shouldn't make these claims, because if anything arguably you used a hasty generalization or fallacy of composition.

Not all cryptocurrencies are bitcoin nor do they work the same at all. For example, many don't even use "mining", which is the source of bitcoin's outlandish energy waste. I really have no interest in discussing cryptocurrencies, but at least don't do so in defiance of common sense.