The crypto lending business is indeed carried out by those who have a large crypto value and it will provide a definite advantage for the borrower, but still we must take into account security and trust.
Those who have a large crypto in possession would rather want it not wasted on things that easily wrong by investing. They would rather use it to open their own lending business but that too would be one using proper debt collection procedures and collateral securing. Without those the concept of lending and earning interest from it will not work out. The lender never does anything for the advantage of the borrower, it is a business after all and only those lenders who are professional would be good in handling such a business.
The market for crypto lending is still something that has not been tapped into. Lets hope it becomes big as bitcoin becomes more popular.