But only a (very) small portion of that cash is moving towards crypto (and a whole lot wil get burned in the next correction and move away again as a result)...
You're right, but I was primarily concerned with the costs of a conservative bank. Because of the negative interest rates, one or two things have been changed for wealthy people and now it's going on to lower wealth. This should make more people react, but we'll see if that happens.
I would not compare the fact that a lot of money goes out of the crypto market in a phase of correction with past corrections, the circumstances are different in this day and age.