Very low-interest rate is nothing else than slowly burning your money (because of the real inflation you can feel in the pocket).
You'd have to be a moron to save your money in a bank these days anyway--the interest rates were already near zero. I wasn't even aware the Fed had lowered them, and that's actually surprising news to me if it's true (I haven't verified it and really don't care to).
The thing with extremely low interest rates is that investors have to look for alternatives paying more than what a bank guarantees, and that's usually the stock market. It also makes it very easy for traders to trade on margin, with a lot of leverage--and they do. That leads to asset inflation as they keep buying stocks, bonds, crypto, whatever. The real problem is when interest rates start to rise again. That's when everyone gets spooked and markets start to tank.
Not sure how bitcoin reacts to interest rates in general, but I'd think that it'd be an inverse correlation if there even is one yet. It's still a very new asset class and I don't think there's a ton of institutional money in it...yet. Watch out when there start to be futures markets for bitcoin and other cryptos, because at that point I'm pretty sure they'll start to be very sensitive to interest rates.
Well that is their choice and there is not point to call those who are into it a moron, we have many people that still does not understand the system of crypto, so they would always keep their und in banks even if it is not going to yield profit. It is just the same way people would keep their fiat in stable coin because of the volatility of other coins. It is best to those keeping money in ban k to do so than just to wake up one day and realize that the money they kept in a particular cryptocurrency rather than yielding result had turned zero.
And even you, if I ask you to declare you bank account, I can bet you will not be bold to show it because it is not zero and you still have your own money saved there. Cryptocurrency is a gradual thing and with time, people will start adjusting to it.