As for this:
> Right now, you can take out a loan without involving a bank from one of the many crypto lending protocols. You put up some collateral and can take out a loan for extremely cheap, because there isn't a bank in the middle to take a cut.
The reason loans on the blockchain are cheap is not because there's no middle-man but because they're over-collateralized so there's no risk. One of the reasons the bank charges you interest is that they're taking a risk that you will not pay back the loan. AFAIK this is not possible in DeFi.