Wait, what do you mean by this? What this means is that you want to invest in Bitcoin but don't have the money or funds to buy it, and in the end, who do you imagine borrowing ETH from? And use it for Bitcoin? Honestly I'm still confused with this concept. However, because this is related to loans, I disagree and will not make ETH loans to buy Bitcoin, this is really problematic and risky. Especially if one day Bitcoin goes up, then ETH will also go up, so the comparison is the same.