Do you have a link? Highly interested in that thread. Do you know if people discussed how state solutions faired? I'm assuming something like Pix from the Brazilian Central Bank does an even better job at prevention while providing a public service.

https://www.library.hbs.edu/working-knowledge/how-credit-car... probably this

Pix, UPI, and a few more

That would be this post of 16 days ago, 453 comments: https://news.ycombinator.com/item?id=49432201