well everyone asks for collateral if someone have a stable coin why he dont go to exchange and exchange them and use .. it ..
And why they give someone 120% of the loan?
If the alt coin rises in values after you exchange it, you will not get the same amount of alt coins back. If you take out a loan during that period of time and the alt coin rises in values during the loan, once you repaid the loan, you can have it back. alt coins are generally unstable, in case the alt coin loses value, the 20% can cover the value lost if borrower decides to default.