Add Saudi billionaire Prince Alwaleed bin Talal to the roster of high-profile investors and financiers who don’t believe bitcoin and other cryptocurrencies are here to stay.

“I just don’t believe in this bitcoin thing. I think it’s just going to implode one day,” Alwaleed told CNBC in an interview Monday morning. “I think this is Enron in the making.”

Bitcoin BTCUSD, -0.12% is up around 500% in 2017 and last week topped $6,000 for the first time. Bitcoin was down 1.5% at $,5813.25 in recent trade, according to Coindesk.com.

Energy firm Enron collapsed in 2001 in one of the largest accounting scandals in U.S. corporate history.

From the archive:Enron workers lost everything

Alwaleed said bitcoin “doesn’t make sense. This thing is not regulated, it’s not under control, [and] it’s not under the supervision” of any central bank.

Of course, to bitcoin proponents, those same criticisms are features rather than bugs.

Read:What one strategist sees taking bitcoin ‘into the stratosphere’

Alwaleed has plenty of company among bitcoin doubters. Alwaleed said he agreed with J.P. Morgan Chase & Co. JPM, -3.09% Chief Executive Jamie Dimon, who last month likened bitcoin to the 17th century tulip mania, an early market bubble, and branded cryptocurrencies a “fraud” that would eventually implode.

And billionaire investor Ray Dalio, founder of Bridgewater Associates, the world’s largest hedge fund, last month said cryptocurrencies like bitcoin met his firm’s criteria for a market bubble.

Not all big-shot financiers are cryptocurrency skeptics, however. Morgan Stanley Chief Executive James Gorman last month said the phenomenon was “more than just a fad.”

Read: ‘Fraud.’ ‘More than a fad.’ The words Wall Street CEOs are using to describe bitcoin