Um, how is this extortion?
In my opinion if i was the lender i would have done a similar thing. Because after all, logically speaking after the fork bitcoin cash + bitcoin would equal to roughly the value of 1 bitcoin before the fork. There could be a scenario where the price of bitcoin drops dramatically as a result of the fork, clearly it didn't happen this time but it is a possibility.
I'm sure that Lone Shark is financially secure enough and probably don't even care about 0.03 BTC or so.
He didn't threaten his borrowers, he simply asked them to either repay the loan or pay bitcoin cash + bitcoin, which they will get anyways[1].
Anyways he has waived all bitcoin cash repayments [2] anyways, so if your agenda was really to help the borrowers then you already have seen your desired result. But i feel like you're just launching a personal vendetta on Lone Shark...
Everything about your post is messed up. But I will try to explain-
[1] You are assuming they still had the BTC at time of fork and got BCH. What if they borrowed BTC to pay for urgent dental work for their grandmother with the intention of buying back BTC from her next government check to pay back the loan? With the demands from Lone Shark, they would now need to pay back more than agreed. Not fair and may not even be possible for grandmother.
[2] Lone Shark has NOT 'waived bitcoin cash repayments' which he had no ability to waive anyway. He did not state in his post that no BCH was due. He simply gave borrowers the option to repay BCH. Very different things.
Please keep borrowing from Lone Shark as you see fit. That is your rightful choice. And please comment in this thread as you wish, but please try to first get a full understanding of what is being discussed.