Microsoft co-founder Bill Gates hasn't been too vocal on the subject lately, but he has expressed a cautiously positive opinion in the past.
"Bitcoin is exciting because it shows how cheap it can be," the self-made billionaire told Bloomberg in 2014. "Bitcoin is better than currency in that you don't have to be physically in the same place and, of course, for large transactions, currency can get pretty inconvenient."
https://www.cnbc.com/2017/12/19/bill-gates-in-2014-bitcoin-is-better-than-currency.html
Actually this statement of bill gates is over exaggerating,because the real truth is that traditional currency,is always leads in the market and very convenient to use,because digital currency is only an alternator of fiat in terms of any kind of transaction in the market.actually in real talks until cryptocurrency will not become legalize globally,the traditional currency is the main source of our currency system.