Hello. I see different platform like nexo, blockifi, etc... that can borrow you crypto or stablecoin. I'm here to ask if you have a strategy for example you borrow btc with an interest rate of 6% and then you use it on defi with 8% APR. Thanks for helpful. 
With crypto, or fiat, made investment with borrowed money is really bad idea. Maybe almost everyone's answer is same, not agree to do it. Because investment is risky, and not every investment will gain profit. It will make people more suffer if they lose, because they still must pay their loan.