overall blockchain DeFi lacks development for short-term lending markets
short-term market volumes are larger than M2 & Co.
yes, you can lend on AAVE, but rates vary greatly
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!