The missing piece to this story is "What changed" regarding shipment to China? It sound as if your prior sending avoided customs and a customs fee. Perhaps there is closer observation of dutiable mail articles to China. There have been SCF threads about this on postal exchanges between the USA and other countries.
Otherwise, if the "regular customer" suddenly began to be hit with customs fees, I can understand his response.
At least in the end, you, as was the buyer, suffered no harm. It was only
ebay who needed to eat the cost. I don't see
ebay allowing this outcome to become a regular event, nor does
ebay control the CC company's relationship with the card holder.
My suggestion to you is be real clear with your China customers, customs will be holding their packages in customs and expecting duty. Also understand the CC companies will back the buyer because the item did not in fact arrive to the buyer.
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I made this post just after hanging up from
ebay customer service who told me that yes, the seller was suspended by
ebay but my purchase, not sent, paid on the 5th must wait until the 14th before I can begin a refund request for not receiving the item. Yet the reason this seller was suspended was for repeatedly selling the "same mythical item" collecting payments and not shipping anything. Not my first seller problem but still frustrating that I have to wait and play the game over days to get what will be my
ebay protection refund.