It's funny how people freaked out over the -0.1% interest rate but don't care about having money in the bank when the inflation is at +10%.
I don't live where negative interest is a thing, but it seems like that would encourage people to keep money outside of banks.
If you had a pile of cash, it would remain a pile of cash. If you had 100,000 euro in the bank that might be 99,000 euro after some time because the bank essentially charges you a storage fee as interest rates are negative. Conversely, the bank would essentially be paying you to take out a loan.
Maybe I'm misunderstanding how it works since it's never happened in the USA, but I think that I have it right. See https://www.investopedia.com/articles/investing/070915/how-n...
As for negative interest rates, here in the Netherlands banks didn't dare to go negative, even if conditions would warrant it. Perhaps because it might trigger a bank run.