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Meta's new AI agent Muse has reportedly outpaced ChatGPT's early mobile launch, racking up more downloads and daily active users in the US and Canada. However, security researchers at Ars Technica disclosed a serious zero-day vulnerability in Muse, noting its extraordinarily broad system privileges make it vulnerable to a simple ClickFix attack that could hijack the agent. At the same time, Amazon has blocked Muse from operating on Amazon.com, underscoring rising tension between rival tech giants over AI agents' access to competitors' platforms as Muse's popularity grows.