https://www.cnbc.com/2018/05/07/bill-gates-i-would-short-bitcoin-if-i-could.html

Microsoft co-founder Bill Gates said Monday he would bet against bitcoin if he could.

"As an asset class, you're not producing anything and so you shouldn't expect it to go up. It's kind of a pure 'greater fool theory' type of investment," Gates said on CNBC's "Squawk Box."