When the money being lended is digital and not backed by anything it’s even worse.
(Yes, I know "usury" has had other meanings, but this is the current, common definition, and if you're going to use a word in a way that's uncommon, you should be prepared for confusion.)
> usury (loans made for unproductive purposes)
If illegal loans have financed our cars, education, and homes, then where are all the criminal prosecutions? Where are the lawsuits to recover the exorbitant rates? Was it consumers taking these illegal loans? Or was it the established banks, negotiating illegal and exorbitant rates with criminals? Is that why banks fail, or are "too big to fail", because we are reluctant to expose their criminal activity?
We heard of people "walking away" from their home loans during the 2008 recession; it's difficult to walk with broken kneecaps! We heard that their loans were "underwater", but we didn't realize they were "sleeping with the fishes"!
If you've read the other comments I don't understand why you're still confused.
https://news.ycombinator.com/item?id=47882360 pointed the finger at the general practice of moneylending, known for most of history as "usury", for high housing prices. This is broadly true - lower interest rates equal high prices.
Others thought they meant modern usury, which is lending money at higher than the legal maximum interest rate.