First-order effects

• eBay loses its principal legal lever against Amazon's seller-recruitment tactics, leaving the cease-and-desist route exhausted and any further response confined to product or policy competition rather than the courts.
• Amazon gains a courtroom precedent that recruiting rival platforms' merchants through their internal messaging channels is not, on this record, actionable coordination.

Second-order effects

• Other marketplaces weighing similar claims now face a higher bar: the eBay playbook of suing over seller poaching has been tested and failed, pushing disputes toward pricing and exclusivity allegations like those surfacing in California court filings instead.
• Enforcement pressure shifts to regulators and class actions — the venues where Amazon is already contesting FTC and UK claims — raising the stakes of those cases as the remaining checks on its marketplace conduct.

Third-order effects

• If the pattern holds — private platform-versus-platform suits failing while regulator and consumer-class challenges also struggle — marketplace conduct ends up governed mainly by Amazon's own policies rather than litigation, concentrating structural power in the largest platform.
• The divergence between losing private suits and surviving public ones may eventually prompt lawmakers to reconsider whether existing antitrust tools fit multi-sided marketplaces, though which direction that takes is genuinely unresolved.