Stores don't run marketplaces. They buy outright from their suppliers.

Idk, but I find it especially funny because the ones Amazon basics is competing in are the silliest businesses to try and protect. Almost all of them just buy the same product from china and have the manufacturer slap their label on it. There are dozens of these "brands" whose only function is to handle the batch ordering, shipping it to amazon who then actually handles the logistics, and customer support which usually just involves trying to bribe anyone who gives a bad review into changing their rating.

It's not even like Amazon bans the other brands from selling on their store. They are free to keep competing with amazon for the same exact product. It sounds like they just don't want more competition for their low value add business.