For me loans are very risky for the lender, it is not a problem for the borrower since they are going to collateral some of their assets.
Because they have going to collateral something it is not easy to sell that immediately.
It takes time before they are going to get some returns.
Risk goes to both parties, Borrower and Lender
Borrower risks his collateral in exchange of money or Bitcoin, example is if the collateral used is an account here in Bitcointalk.org and the Lender posted without the knowledge of the Borrower, Borrower is at risk of being kicked out of the signature campaign because of the quality of post by the lender who used the collateral. Lender may also remove the signature which may result to being again kicked out of the campaign.
Lenders risk is if the account used was not disclosed in public and collateral was offered only through PM, huge risk of being the account used a s collateral maybe hacked or have an existing loan. lenders should scrutinize the account before lending.