Bidders are retracting bids as a regular strategy now, because Ebay allows them to. Has nothing to do with shilling for the most part.
All you can do is either block them or warn them when they start messing with YOUR auctions..............but if you started blocking everybody who has a ton of retractions with other sellers nowadays, you'd be left with very few bidders.
Ebay could solve this very easily by warning or suspending bidders with multiple retractions, but they don't seem to have any interest in doing this.
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