repo markets are HUGE - about the size of USD M2!
they underpin the global financial system
however, there's not many DeFi protocols addressing this part of the market
i may pick it up in the near future
if you're working on something similar - hit me up!
in the end, you get your UST bond back
and it makes sense for you to repurchase the bond (collateral) even if the price falls
as long as the price fall is < โhaircut (2% in our case)