Here is eBay's abounding account of banned or ambiguous items:
Academic SoftwareAirline and Transit Related ItemsAlcohol (also see Wine)Animals and Wildlife ProductsAnti-circumvention PolicyArtifactsAuthenticity DisclaimersAutographed ItemsBatteriesBeta SoftwareBootleg RecordingsBrand Name MisuseCatalog SalesCatalytic Converters and Test PipesCelebrity MaterialCharity or Fundraising ListingsComparison PolicyCompilation and Informational MediaContracts and TicketsCounterfeit Currency and StampsCounterfeit ItemsCredit CardsDownloadable MediaDrugs & Drug ParaphernaliaElectronics EquipmentEmbargoed Appurtenances and Banned CountriesEncouraging Infringement PolicyEvent TicketsFaces, Names and SignaturesFirearms, Ammunition, Replicas, and MilitariaFireworksFoodFreon and Other RefrigerantsGift CardsGovernment IDs and LicensesHazardous, Restricted, and Perishable ItemsHuman Parts and RemainsImportation of Appurtenances into the United StatesInternational Trading - BuyersInternational Trading - SellersLockpicking DevicesLottery TicketsMailing Lists and Personal InformationManufacturers' CouponsMature AudiencesMedical DevicesMisleading TitlesMod Chips, Game Enhancers, and Boot DiscsMovie PrintsMulti-level Marketing, Pyramid and Matrix ProgramsOEM SoftwareOffensive MaterialPesticidesPlants and SeedsPolice-Related ItemsPolitical MemorabiliaPostage MetersPre-Sale ListingsPrescription Drugs and DevicesPromotional ItemsReal EstateRecalled ItemsRecordable MediaReplica and Counterfeit ItemsSatellite and Cable TV DescramblersSlot MachinesStocks and Other SecuritiesStolen PropertySurveillance EquipmentTobaccoTravelUnauthorized CopiesUsed ClothingWarrantiesWeapons & KnivesWine (also see Alcohol)
Most of this is actual accessible - of advance you can't advertise actionable things like drugs, pyramid schemes or baseborn goods. Almost aggregate that is on the account is there because there is law adjoin affairs it. Some of the reasons, though, are a little strange.
The 'autographed items' entry, for example, doesn't beggarly that you can't advertise annihilation that's been autographed - it aloof agency that you can alone advertise it if it comes with a affidavit of authenticity. The 'artifacts' access prohibits you from affairs Native American graves; 'celebrity material' agency you can't advertise unauthorised pictures of celebrities; 'embargoed goods' agency that you can't advertise annihilation that comes from Cuba