Ebay is a large corporation with a lot of enemies around the world, resulting from its treatment of the customer (both buyers and sellers), near total lack of
customer service, naked
corporate greed, and corporate secrecy. The term "evilbay" has, not surprisingly, come into common usage when referring to the firm. It's commonly heard at flea markets and estate sales, and has become part of our modern culture. It clearly deserves to be officially added to
urbandictionary.