What is the ruling on education loans based on mutual support, in which the borrower is required to pay an additional amount to help future students?

The condition of an increase when repaying a loan is forbidden usury (riba), whether the increase is for the lender or for someone else, due to the Prophet, peace and blessings be upon him, saying: "Every loan that draws a benefit is usury." However, if the borrower wishes to repay the loan with an increase out of his own volition, without it being stipulated in the contract, then this is permissible.