Meta's Muse AI Agent Tops 900,000 Downloads in Six Days, Surpasses ChatGPT Launch Pace as Amazon Blocks Access Over Terms-of-Service Violations

Meta Platforms' new AI agent Muse reached the number one spot on Apple's iOS and Google Play US app stores by September 21, 2026, with more than 902,000 downloads in the six days following its September 8 launch, surpassing the 773,000 downloads of its predecessor Meta AI app in the same post-launch period, according to Sensor Tower analyst Abe Yousef cited by Bloomberg. Meta shares surged nearly 12 percent on Monday September 21, driven by Wall Street price target upgrades and intense investor excitement over the autonomous AI agent, which is designed to complete tasks like shopping, booking appointments, negotiating bills, and filling out forms on behalf of users. Amazon blocked Muse from its retail site on Sunday night September 20 after Meta declined a request to remove the bot, with Amazon citing violations of its terms of service that prohibit automated tools from shopping its site, according to Bloomberg and The Register. Shoppers attempting to use Muse on Amazon now see pop-ups stating that access by an unauthorized AI agent violates Amazon's Conditions of Use. The block came as Muse demonstrated rapid adoption, outpacing ChatGPT's early mobile launch in both downloads and daily active users over comparable periods in the US and Canada, according to Apptopia estimates reported by TechCrunch. The Muse launch matters for Meta's capital markets positioning because it demonstrates the company can compete in the consumer AI agent market beyond its core social media advertising business, potentially opening new revenue streams tied to transaction commissions or premium features. The Amazon block, however, signals the friction ahead as AI agents that access third-party platforms without explicit partnerships face technical and legal barriers. For investors, the question is whether Muse's early momentum translates into sustained engagement once the novelty fades and whether the trust required to hand an AI agent passwords, payment methods, and inbox access will sc