He also doesn't request interest at all, but he does accept tips.
Off original topic, but it appears to have resolved itself...
Receiving money (tips) for offering a loan is called interest. He's still charging interest, but only to people who choose to pay it.
It's the same as those big box stores. They offer you a no interest loan, but
charge you $50 to apply for it. Interest is the cost of borrowing money - that $50 payment is interest no matter what they call it.
If you make a big enough fuss, you can get them to remove the $50 fee, same as he won't take your tip if you don't offer it.
There is a misunderstanding here.
Meaning of interest:
"
Money paid regularly at a particular rate for the use of money lent, or for delaying the repayment of a debt" ~ Google.
For a loan to be considered as repaid, you need to pay the interest but for no-interest loans, repaying the borrowed amount is enough. You don't want to pay a penny more than the amount you borrowed.
Interest is enforced but tips aren't.
The example you gave is charging interest but it is different from this.
Stiil looking
Any steam items?