New Challenges in Amazon Multi-Store Anti-Association: A Deep Isolation Guide to Handling the 2026 "Brand Guilt-by-Association" and New BSA Rules

In 2026, Amazon's risk-control logic has escalated from single-account checks to full-chain penetration—brand-authorization guilt-by-association, tightened Section 18 of the BSA, and the INFORM Act annual verification have become the three major compliance challenges for multi-store sellers. This article deconstructs the trigger mechanisms of hidden associations and explores how to build a multi-account security foundation spanning environment storage, network pre-checks, and passwordless service-provider collaboration via NexBrowser.