Indeed, some of them do make their own charge on the credit card, and I end up handling the resulting mess.

There's several variations on the theme, some of them actually calling out the correct name for the product, but acting like they are some sort of authorized reseller.

Other ones have a relationship with vendors of similar products, and get paid for those purchases. They include my product only for completeness, and make no money on the transaction.

They do, however, get the Customer eyeballs, and create confusion. My product gets tied in with their advertisements, or perhaps their interface keeps crapping out, and I get that feedback.