I said it before and say it again. These things you call cryptocurrencies can be anything you want but currencies. Who ever claims the contrary has no clue about how a currency works.

If you claim this is a highly speculative asset, then yeah, you are right. But if you really want to call this a currency, you have to convince a government to use it as an official currency. No central bank in this world will accept to use a currency that is out of its control, that can't depreciate or appreciate at will.