Haha it would be great if the interests rate were at least positive (+) small. The truth is that banks are now even raising negative interest rates on deposits. That is crazy, seriously. They want by all means that you pick up your money and either let it shrink in your safe at home due to inflation or that you damn bloodily put it into the stock market further inflating equity and housing prices. We are going to face a big fat bubble exploding right into our, yes... faces...
There is a risk in certain ways almost everywhere. With fiat it is the inflationary risk and the hyper surveillance possibilities once it is fully digitized. With cryptocurrencies you have a whole lot of other risks that maybe regulatory or legal, but also volatility risk. There is of course also technological risk involved, which is not quite the case for fiat currencies.