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. 
Well, I don't recommend that. we don't know when a place could become a scam. maybe you can make a profit in the first round, but what about the next. besides, I think it's too risky to borrow money just to invest elsewhere. however, I don't think it should be recommended, and I think it carries a high risk.