The 9th Circuit just overturned Amazon's injunction against Perplexity AI on August 4, freeing the company's Comet shopping agent to operate on the platform again. The ruling pivots on a single legal distinction: when an AI agent browses and buys on your behalf, you're the one accessing Amazon, not the software vendor. That reframes everything about how autonomous agents can function across digital commerce.
Amazon had sued Perplexity last November, claiming Comet violated both the Computer Fraud and Abuse Act and the company's terms of service. A district court agreed in March, slapping down a preliminary injunction that shut the bot down. The appeals panel saw the mechanics differently. After hearing arguments in June, the judges concluded Amazon couldn't likely win on CFAA grounds. The reasoning was clean: users direct the agent, users own the Amazon accounts, Perplexity just built the tool.
What happens now
Comet can now resume comparing prices, reading reviews, and executing purchases across e-commerce platforms on your command. The $21 billion startup built the agent to automate shopping decisions. But the legal win extends far beyond Amazon. Courts have essentially blessed a framework where AI agents inherit whatever permissions their users already have. That logic could apply to virtually any digital service where autonomous agents operate.
The precedent matters because it settles a core question: are AI companies liable for bot behavior when users direct that behavior, or does authorization flow from the human? The 9th Circuit chose the latter. That opens the door for a whole category of agent-based services. Banking bots, travel agents, content platforms, email automation. Any service where users want software acting in their stead now has clearer legal ground to stand on.
Amazon's cease-and-desist in 2025 hadn't stopped Perplexity from arguing its case. The appeals court basically said cease-and-desist letters can't override the legal reality of user authorization. That's the move that changes the game for agents operating at scale.
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