So if Bitcoin grows 300%, that means your collateral is now worth 300% more. You can either withdraw a portion of it back to your normal wallet or you can just

So if Bitcoin grows 300%, that means your collateral is now worth 300% more. You can either withdraw a portion of it back to your normal wallet or you can just borrow more against the same collateral. So it's like a credit line that's always appreciating in value. If one day, you need the whole collateral for whatever reason, then you'd pay the loan to unlock it fully and withdraw it.