How is it different from a centralized database that also stores and tracks ids of their products? A lot of companies that have to deal with scammers counterfeiting their product were using these methods even before blockchain was invented. And what would stop scammers from doing the oldest trick in the book - copying the identifier of a genuine item and slapping it on their fakes?
Exactly what I was just thinking.
Perhaps make the verification/secret keys (which should be worth the price of each product) their products tokens so that customers can buy them first before they can verify the products with the keys, maybe combined with codes on the products.
The companies could even hide certain features on their products and put them in better smart-contracts for users to find and verify their products more properly.