This user will approve a 50% loan with collateral from the borrower, meaning he will have 50% more amount of money with the lender than the borrower's loan. It is risky to send collateral to such a low rank member, even if he gives a loan to a borrower with collateral, he has 50% extra funds than the loan, which means he will be profitable even if he runs away with the collateral money.
So the feedback given on his profile is reasonable, and that's what he intended.
There's no reputable lender here that asks 50% more of the collateral Obviously there is a bad intention on his side, even if he tries to defend his business he is already exposed, he failed to do research on how lending is done in this forum, he just set up his own terms and rules that is unfair for members here.
Those who want to set up a lending business here, have to do research on how lending works here, establish their reputation, and above all be fair to those who want to take a loan, OP's business is worse than a loan shark.