there is no doubt about this that loans are too risky, because no one know know that what is going to happen to the price of bitcon either its price will increase or decrease, And by granting a large loan must take a pledge that exceeds the cost of the loan. And still need to do everything right from a legal point of view, to conclude an agreement
Its not risky if the borrower will provide you a god collateral you must check what collateral he is offering it can be risky if the collateral is altcoin because there are possibilities the price will dump.
A good collateral is a must, Without a good collateral and the borrower shouldn't get loans. It has become rules.
The collateral must worth more than the total of loans had given by the lenders. If you have seen the bank and they already did it for a well with this way.
It just like an obligation for the borrowers for offering a good collateral.