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davidcyclebackThey could, of course, notify bidders that it would be wise to have different id and email name. I'm not even aware that a majority of eBay users have ids that match their email names.
Besides, most sellers (whose ids you can see) are also bidders.
Much of the stuff eBay has been doing lately has favored bidders at the expense of sellers. Blocking bidder ids, however, harms bidders.