A federal judge in San Francisco has sided with Amazon in its legal battle against an artificial intelligence startup that built a browser capable of shopping on behalf of users. The ruling marks a significant moment in the growing tension between Big Tech incumbents and AI-driven newcomers.
Senior U.S. District Judge Maxine Chesney on Monday granted Amazon a preliminary injunction barring Perplexity AI's Comet browser from accessing Amazon's website, agreeing that Amazon is likely to succeed on the merits of its claims under both the U.S. Computer Fraud and Abuse Act and the California Comprehensive Computer Data Access and Fraud Act. Amazon had sued Perplexity in November, alleging the AI tool accessed users' password-protected accounts without Amazon's authorization and transmitted private account data to Perplexity's servers.
According to Courthouse News Service, Judge Chesney wrote that "Amazon has provided strong evidence that Perplexity, through its Comet browser, accesses with the Amazon user's permission, but without authorization by Amazon, the user's password-protected account, thereby obtaining information as to the user's private Amazon account information, and that such information is transmitted to Perplexity's servers for the purpose of conducting said user's requested tasks." She also found that the balance of hardships favored Amazon in this dispute.
At the heart of the case is a deceptively simple question: can an AI agent act on a user's behalf inside a platform that never consented to its presence? According to Amazon, the answer is no, and the way Perplexity went about it made things worse.
Amazon alleged that Perplexity deliberately configured its Comet AI software to disguise its activities. The company stated: "Rather than be transparent, Perplexity has purposely configured its Comet AI software to not identify the Comet AI agent's activities in the Amazon Store: Perplexity falsely identifies its Comet AI agent activity as coming from Google Chrome."
Amazon further argued that "Perplexity's Comet AI agent covertly poses as a human customer shopping in the Amazon Store on a Google Chrome browser." The company also cited a news article from October claiming the Comet browser and AI agent are vulnerable to attacks from cyber criminals who could potentially hijack the tool.
The dispute has sparked a broader debate about whether dominant platforms can block AI tools that serve their own customers. Perplexity pushed back forcefully, arguing that Amazon's motives are far less noble than the company claims. Perplexity called the lawsuit "a bald attempt by Amazon to block its own customers from using defendant Perplexity's groundbreaking Comet AI Assistant on Amazon.com." The AI startup framed the conflict as one about advertising revenue, not consumer protection.
In a pointed statement, Perplexity argued: "Why? Because AI agents don't have eyeballs to see the pervasive advertising Amazon bombards its users with, and cannot be upsold to buy more products. Those are the real reasons Amazon filed this suit and seeks a preliminary injunction — not its claimed altruistic concern about protecting consumer data and the 'customer experience.'" An attorney for San Francisco-based Perplexity reportedly did not immediately respond to a request for comment on the ruling itself.
Here's where this gets interesting for anyone watching the intersection of artificial intelligence and free markets. Perplexity is no scrappy garage startup — the company was valued at $21 billion as of early this year and reportedly counts Portuguese soccer star Cristiano Ronaldo among its investors.
From a free-market perspective, there's a legitimate tension at play. On one hand, consumers should be able to use whatever tools they wish to find the best deals. Price comparison and product research are core features of competitive markets, and AI-powered assistants could theoretically make shopping far more efficient for everyday buyers.
On the other hand, property rights matter. Amazon built its platform, sets its terms of service, and has every right to determine who and what accesses its infrastructure. If Perplexity's tool was masquerading as a standard Chrome browser while scraping account data and routing it through its own servers, that raises serious questions about consent and authorization — regardless of whether the individual user approved it.
This case is likely a preview of many more legal battles to come. As AI agents become more capable of acting autonomously on behalf of users — shopping, booking travel, managing finances — established platforms will inevitably push back when those agents bypass their revenue-generating systems, particularly advertising.
For investors tracking the AI space, this ruling is a reminder that valuation and innovation alone don't guarantee market access. A $21 billion company can still be blocked from operating on one of the world's largest e-commerce platforms if it runs afoul of existing computer fraud statutes. The legal framework surrounding AI agents remains largely untested, and early rulings like this one will shape the landscape for years.
Consumers, meanwhile, should pay close attention to what data their AI tools are accessing and where that data goes. The promise of smarter, faster shopping is appealing, but the underlying mechanics — who has your password, who sees your purchase history, and who profits from that information — deserve scrutiny. In markets and in technology, transparency isn't optional; it's the foundation of trust.