Something can't be both a currency as well as a speculative asset. Bitcoin was conceived as a currency. It promised fast transaction, low fees and no central trust provider authority like a government or a bank. But it and countless other cryptos have morphed into something people speculate on for gains. There is still very little you can actually buy using crypto. It's useless as a medium of exchange (volatility, high fees, non-reversible, slow etc). The high volatility and lack of any underlying utility whic can give it a value means it is a ponzi scheme and only those who got in early will come out richer. Late entrants will end up holding bags of worthless digital tokens.