Using ETH as collateral is a tactic to boost capital efficiency in the bull.

In bear, you always hold stablecoins and trade spot.

In bull, you need to understand that a major asset like ETH will continue to rise.

Using it as collateral can be a way to capitalize on the upside of altcoins (e.g. going 2x long) while still holding ETH.

Be careful out there, as you may risk losing the ETH you have.