There's zero reason to "trust" Amazon about anything. (And yes, I know the retail and AWS sides of the company are different, but it's still the same company. The same rot is always there, just shuffled around.)
every single retail company does this, they allow suppliers to sell the product using retails's infrastructure, and then retailer turns around and create private label products using sales data (Costco's Kirkland Signature, Walmart's Great Value, are just some examples)
They absolutely go out and find who can make the product and the quality and price they want. It’s not always an identical product to the brand name on the same shelf. Sometimes it displaces the brand name.
everything from amazon is coming from China, I dont understand why does a random person who resells stuff from Chinese factories via Amazon FBA feels entitled for exclusivity arrangement with Amazon?
Was such exclusivity encoded in some form of legally enforceable agreement ?