Centralisation has it's way of controlling and forcing people, if they can get their hands on people then they can control Bitcoin, the real strength of Bitcoin is it's people.
Are there people who borrow money by using Bitcoin as collateral? I think more people borrow from banks to buy Bitcoin. But I remember that companies like Goldman Sachs, JPMorgan Chase, and Jeonbuk Bank offer services like this. But is it effective? I don't have clear details on how successful these programs are. Obviously, the bank makes an offer, and if someone has BTC and needs it, they will definitely take out a loan. Of course, the BTC will be stored by a special custodian institution, not held directly by the bank or kept off the bank's balance sheet. But in the end, I thought, they would not pledge Bitcoin to the bank to get fiat.
There are people who borrow money by using their Bitcoin as collateral, and that is a very big risk, it might be a good Idea fit them because they don't want to touch their Bitcoin, but for me, it is very that can lead to them selling their Bitcoin in the end, instead of using bitcoin as collateral I will sell some part of the bitcoin and when i have the money to buy back i will do the right thing, when you borrow money from bank you will not have a good rest of mind because you will be remember the loan and when to pay it back.
Bank can convince people but they can not force anyone to take the loan, banks know what they are doing and that is why they will accept Bitcoin as a collateral, they know the value of bitcoin and important it is they can get their money when you don't pay, they can't control anyone bitcoin but they believe the person can pay their loan back with having any issue.