The Fukushima nuclear accident had a far narrower impact than this will have. The Fukushima accident did not result in a 'push button to gain money' GitHub software projects.
If an angry video call from the boss is all that is required to exfiltrate millions of dollars, and boss video calls become as easy to produce as spam emails, then the exfiltration of funds from Japanese organizations becomes as fast as approximately (spam email send rate) * (millions of dollars).
When you have received the 7th angry call from the boss that day, demanding funds be sent immediately, you eventually realize you need a different system. At a minimum the boss will need to come be angry in person.
