To the extent an asset’s exchange-value exceeds its use-value, it is said to be a bubble.
Money is used only for its exchange-value, so money is the bubble that never pops.
Since Bitcoin is 100% exchange-value and 0% use-value, its critics are right: it is the biggest bubble in human history.
However, its critics are also wrong: because #Bitcoin is 100% pure money, it is the bubble that will never pop.