Financial instruments are always created to benefit one side more than the other. That in itself is fine.

The problem becomes when the side that disproportionately benefits also has an imbalance of power to pull the rug out from the other side. They are incentivized to be less than transparent.

It's almost always due to a misrepresentation of risk, which people seem to be keen on if they can pass that risk downstream, and the least informed end up holding the bag.