It seems Poloniex acted contrary to my ownership interest in the ETC by giving away all of it to the lucky person who loaned my pre-HF ETH at the interest rate of 0.01%.
I don't think the person who loaned it got the free ETHC. Myself I had a short open and it doesn't look like I got any ETHC for that. So I guess Poloniex is holding the ETHC for the loaned coins.