In his own reddit AskMeEverything page,
https://www.reddit.com/r/IAmA/comments/80ow6w/im_bill_gates_cochair_of_the_bill_melinda_gates/He answers about cryptocurrency stating
The main feature of crypto currencies is their anonymity. I don't think this is a good thing. The Governments ability to find money laundering and tax evasion and terrorist funding is a good thing. Right now crypto currencies are used for buying fentanyl and other drugs so it is a rare technology that has caused deaths in a fairly direct way. I think the speculative wave around ICOs and crypto currencies is super risky for those who go long.
He isn't wrong in his sense, if the cryptocurrency is to have a future, they should be able to create an environment of trust between themselves and the authorities.
I respect his opinion and can't tell he is wrong.But the thing is why he just saying negative about bitcoin.He should notice the positive side of bitcoin too.Bitcoin is changing peoples life and making Strong in financial.Job less people is working for bitcoin.Bitcoin is making people rich and some are becoming Millionaire.Yes, bitcoin have some problems and what he said is right.But I think If we can solve these issues of crypto currency we can make a good future world.