Not if they used their proprietary data to bid up but never win auctions. Especially since they know other bidders max price willing. So bidding for max-1 would result in no wins, but lots of extra money.
This would make me not use eBay. But there’s really not an alternative for ad markets controlled by Google.
This would make me not use eBay. But there’s really not an alternative for ad markets controlled by Google.