Now to my question. If you "vouch" for someone that they are trustworthy and they take a loan, is the person who vouched putting their reputation on the line? If you didn't trust a person to repay, why would you "vouch" for them?
Of course, he puts his reputation on the line, and even more so, his wallet. By vouching for a creditor, you agree to bear the burden of responsibility for his debts. Therefore, if you take on this obligation, it would be good to have some leverage over the lender. Of course, if you don't want to engage in
charity and pay other people's bills.
In fact, the bank only needs a guarantor as a backup option from which it can extract debts for the creditor.