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Still with any individual currency there is a market where mandated by law you can pay in this currency, or where you can pay taxes in that currency. So zheir value has a real and a speculative part. Crypto only has a speculative part and that part is often and strongly influenced by deliberate manipulation.
And if yet another crypto currencies is pushed it is highly questionable if there is a serious intent to deliver on the promises made to its laternuse or how much is just scamming people into an ICO and then running with that money.