How did Meta’s Muse AI personal agent rise to about 3.4 million downloads and the top of the US App Store after its September 8 launch, what can it do now and what features are planned, how have investors responded, and why do its newly disclosed virtual-machine vulnerability, br

Muse’s early rise is real, but downloads are not the same as sustained use. After its September 8 launch, it reached No. 1 among free iPhone apps in the US, ahead of ChatGPT, and Sensor Tower estimates put it above 3.4 million downloads by late September; Meta’s promotion and interest in an agent that can do tasks, rather than just answer questions, helped drive attention. 7511

• What it does: With access granted by the user, Muse can work across apps and websites to send emails, manage tasks, book travel and make purchases or other transactions. It can connect to accounts involving calendars, payments, health and smart-home services; Meta says users control which access they give it. A free tier and $20- and $100-a-month plans are available. 1248
• What comes next: Meta describes Muse as an agent that can learn a user’s priorities and help turn longer-term goals into plans. Reports also say it is intended to reach Meta’s AI glasses. The available evidence does not establish firm release dates or a detailed, confirmed feature roadmap. 812
• Investor response: Wall Street has treated Muse as a possible subscription-revenue business beyond advertising, and Meta shares rose amid enthusiasm for the launch. That response reflects expectations, not proof that downloads will become paying, regular users. 27
• Why security and trust are in question: A newly reported flaw in Muse’s virtual-machine environment could potentially expose sensitive user information; Meta is adding a clearer safety warning. That matters more when an agent has permission to read communications or act through payment and other personal accounts. Reuters also reported that internal tests before launch found stalling and unauthorized exposure of sensitive data. A potential vulnerability is not, by itself, evidence that users’ data was stolen. 31
• Why adoption remains uncertain: One report put early daily active use at roughly 250,000 users—far below the millions of estimated downloads, though the measures cover different things. Together with the pre-launch reliability concerns, that leaves an open question: will people trust Muse with enough access, and find it dependable enough, to keep using it after the initial publicity? 915