They’re used a lot to maintain uniform exchange rates across Defi projects etc. In theory allowing anybody to borrow a lot of tokens to exploit arbitrage oppor

They’re used a lot to maintain uniform exchange rates across Defi projects etc. In theory allowing anybody to borrow a lot of tokens to exploit arbitrage opportunities means that the rates will converge simply due to market forces (because if one project offers a better rate than another it will quickly be arbitraged away).