they sign you up, and issue you a catalog to order from with a “discount” as a result of you being “sponsored”.
the scam is you are buying your “sponsored” products from a them, at their pre determined “discounted” price.
It would be like me sending out a book, and telling you to order anything you want at my issue price. after charging you 89 bux for the book.
its a sale, your right, not a scam, but either way true sponsorship will pay you and provide whatever parts you need. they pay mileage, they pay for food, that is being sponsored. CS.com is bullshit