Bitcoin and other cryptocurrencies have been an unnecessary distraction for investors and the industry is rife with scams, JPMorgan Chase CEO Jamie Dimon said Thursday. “I think all that’s been a waste of time… Bitcoin itself has been a hyped-up fraud, a pet rock,” Dimon said on CNBC’s ” Squawk Box .” The crypto industry appeared to be making inroads into Wall Street before 2022, before a dramatic decline in market prices and the blow-up of…