It is somewhat disruptive to banks. You can invest stable coins and get interest for example which is higher than bank interest. And the operator doesn't need to spend a fortune applying for banking licenses for each country they operate in.
This not disruptive. This is just normal investing with all the risks attached
Isn't that exactly what they said about tulip bulbs too?
If you want returns in traditional finance, you don't stick money in a bank account. You buy bonds and/or stocks.