Speaking three languages doesn't qualify him as a competent developer.
Just that he seems rather smart in general, or rather not stupid.
I wonder what the motivation to move to Japan was.
He may have a high IQ, but he is not fit to run a giant financial exchange. I'm not sure any single person is, this is why large financial organizations have tons of people with different areas of expertise (development, security, law, finance, risk, etc etc). He rode "internet freedom" all the way to being way over his head and took everyone else down with him.
I'm beginning to think that the only constant in security/crypto is that people fuck it up.
Coding aside, I don't think anyone at HN tries to push the mentality that you should try a financial startup without any accountants or a compliance department.