~snipped
These type of deals could happen only because the logic of stablecoin is to be stable, so the risk is low because other side can't get much from you when it doesn't go down, it is expected to not go down. So, basically assume it this way, you pay 1 dollar for every month that it doesn't go down, but if one day it crashes you get paid 400 dollars instead. Why the difference?
That stability is the difference, you know that tether suppose to be stable and if you do not take that bet you accept it is not stable at all and could go down, many do accept it as stable so take that low bet. I am sure even if this fails, they won't lose too much so it is a good bet.