Along with this, I don't understand how the part of the lawsuit that says "Conditioning sellers’ ability to obtain 'Prime' eligibility for their products—a virtual necessity for doing business on Amazon—on sellers using Amazon’s costly fulfillment service"

is solely an anti-competitive tactic, because how else would Amazon guarantee the fast shipping, etc. if they aren't in control of the fulfilment? I thought prime is only possible through amazon distributing third party products to their warehouses all over so that the shipping can be so fast.