Legendary investor Jeremy Grantham — co-founder of asset management firm GMO and one of Wall Street’s most prominent bubble-spotters — came at Bitcoin again on Friday, calling the asset a “useless, speculative mechanism” destined for slow decline into irrelevance.

Speaking on CNBC’s Squawk Box, Grantham predicted that Bitcoin will “dwindle away, I suspect — not with a bang, but a whimper.” He said he has never owned Bitcoin and believes it will fall to zero, not through a sudden crash but through a gradual erosion of interest over years and decades.

“All Bitcoin does is allow fraudsters to move money around,” he said.

Grantham pointed to Bitcoin’s instability as…

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