If you do have enough Bitcoin in your possession this might mean you might not need to borrow because I would believe you have had enough to invest in that amount of Bitcoin. Why would you have to borrow when you know you would still be paying interest on the amount you borrowed or maybe you want to invest that cash in another profit-generating investment plus let us not forget that there is nothing wrong with taking profit from what you have invested over time. You can not HODL your Bitcoin investment forever without taking profit for yourself then why have you invested in the first place?
Life is challenging and very complex my dear friend!
Do you remember some time ago when Elon Musk decided to sell some of their Bitcoins? They claimed they needed some liquidity for future expenditure, I don't know how true this claim is but if at all Tesla actually has a platform they can take borrow that from, the bitcoin they sold would have acted as collateral for them because it is something they can pay back in future without selling their bitcoin but the question is, is there any decentralised protocol that can actually lend Tesla that kind of liquidity they needed? There is none and they were also not ready to take any risk with their bitcoin because most of the decentralized protocols that we have are full of shits that get exploited every time.
If you have your bitcoin as an investment and you need some cash as an emergency for short time and you don't have any means, you can always borrow but you have to borrow less amount in a way that your bitcoin will be overcollateralized so that you don't get liquidated in case of a price crash and margin calls.