Re: Out of context
Partly it is, and AGCM pointed it out.
Sellers that don't sell through Amazon only, or prefer other logistics services, could be forced to have to deal with two separate warehouse and shipping services if they don't want to use Amazon one and be excluded from some Amazon features. And evidently that increases their costs and makes their business less efficient, while Amazon still subtract customers and orders from other services.
Because as usual both sides of Amazon services are designed to rule them all and in the One Warehouse bind them.