There are a lot of ways eBay can link accounts. Linking of your Paypal and eBay account will share all details of your Paypal to eBay, giving eBay all past histories with that account. Not cleaning out your cookies, forgetting to change your IP address, reading old eBay emails, signing in to an old eBay account and then your new eBay account, using the same auctions descriptions with both accounts, using the same image urls and names in auctions, using personal email address, etc etc etc
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