After reading a bit on the incident, I see the disconnect. I thought it was a pipeline that had been hacked, not a bank. I was talking about critical infrastructure like reactors, dams, generators, etc.
If we're talking about digital banking or digital currency, then yeah it's harder to secure them. Banks can at least keep backup or physical logs. Digital coins are, well, digital. Useful in ways, but many institutions refuse to use them because of their inherent difficulty in securing and stabilizing them.