You can’t hold the collaterals borrowers deposit and lending margins for the idle collateral that’s double spending. Their already collateralized for open borrowing positions it would change the risk significantly.
I think we should arrange work with other yield farming protocols (that don’t use anchor earn, there are plenty with good returns). That are looking for leverage. Another option is whitelisting their governance tokens (if their yield bearing / backed) for deposit as collateral, then direct the voting power acquired by the collateral to enable the protocols to deposit their POL to leverage anchors UST deposits. reference my post here: Fixing the Anchor Rate - #10 by atebites