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Meta's new AI agent, Muse, went to the top of the US App Store within 2 weeks of launch, and nearly all of its users were already on Facebook. That's distribution, the ability to put a new product in front of people you already reach, and it's one of the few moats that shows up plainly in the data.
What Muse is
Meta launched Muse in the US on September 8. It's an AI agent, which means it does tasks as well as answering questions. It runs on its own cloud computer and can book travel, send email and shop for you, checking with you before anything sensitive like a payment (Meta). It's free up to a weekly limit, with paid plans at $20 and $100 a month (Meta Help Center).
Plenty of companies have launched an agent this year. The interesting part of Muse is how fast people picked it up, and where they came from.
How fast
App-tracking firms estimate downloads from the outside, so treat these as estimates. Apptopia counted 1.8 million iOS downloads in the US and Canada in Muse's first 12 days, against 1.3 million for ChatGPT over the same stretch after its app launched. It also counted 642,000 daily US users against ChatGPT's 231,000 (TechCrunch, September 21). Muse went to No. 1 on the US App Store.
ChatGPT is the useful comparison because it's the fastest consumer launch most of us have watched. It reached an estimated 100 million users about 2 months after its November 2022 debut (UBS, via Reuters). And it did that as a brand-new product with no app on anyone's phone.
Where they came from
More than 95% of Muse's users are also Facebook users, and 63% are Instagram users (Apptopia, via TechCrunch).
The mechanism is simple. The day after launch, Meta started running house ads for Muse, meaning ads for its own products inside its own apps. Within 10 days, Muse was getting most of Meta's house promotions, more than Facebook, Instagram and WhatsApp themselves (Sensor Tower, via TechCrunch, September 25).
The audience behind those slots is enormous. Meta's apps averaged 3.60 billion daily active people in June (Meta, Q2 results). That's the number of people who open Facebook, Instagram, WhatsApp or Messenger on a typical day.
Candy bar at the checkout
The candy bar at a supermarket checkout sells because every shopper stands next to it for 2 minutes, and the store decides what goes on that rack. Whether it's the best candy bar in the building barely matters.
Meta owns the checkout line for 3.6 billion people a day. It can put Muse on the rack without paying an outside publisher, because the ad slots are its own. The cost is the ads it didn't sell in those slots. That's real, and small next to what a startup would spend on the same attention.
Distribution still needs the product to be good enough, and Muse's is. Meta's model, Muse Spark, scored 43 on the Artificial Analysis Intelligence Index, a benchmark of model capability, when it launched in April. The version running now scores 61, close to the top (Artificial Analysis, September 2). My read is that reach explains the speed, and the model catching up is what made it worth pushing.
You've seen this before
Microsoft put Teams inside Office 365 when it launched in 2017. Slack had the head start. Teams came preinstalled for hundreds of millions of office workers, and in July 2020 Slack filed an antitrust complaint with the European Commission over the bundle. Microsoft began selling Teams separately worldwide in 2024.
Sound familiar? Distribution wins the first round, and then the fight moves to whoever controls the last step.
The stores own the shelves
Meta owns the people. The stores the agent shops in own the shelves.
Amazon began blocking Muse from shopping on Amazon.com on September 20 and asked Meta to remove Amazon from the experience (GeekWire). The money explains the stance. Amazon booked $68.6 billion of advertising sales in 2025 (Amazon, Q4 results), much of it from sponsored listings that only work if a person scrolls past them. An agent doesn't scroll.
Other stores went the other way. Best Buy, Gap, Sephora, Walmart and Wayfair opened their catalogs and checkout to Muse, and Shopify announced a partnership on September 21 (TechCrunch, September 23).
So Meta's reach gets Muse to every shopper. Whether it gets into every store is still being negotiated.
Where reach runs out
Reach buys a first try. Meta AI, the chatbot inside Meta's apps, passed 1 billion monthly users in May 2025 by sitting in apps people already opened (TechCrunch). As far as I can tell, it never became anyone's default assistant.
Downloads and daily users in week 2 measure curiosity. The number that measures habit is how many people are still using Muse after 30 and 90 days, and nobody has published it yet.
It's also where the money is. Zuckerberg told Meta's Connect conference on September 24 that the company expects to "profit by taking a small fee from transactions." He didn't give a rate. So Meta gets paid only if people come back and shop through Muse, which is the retention number again.
3 questions for any company's distribution
Save these. They work on any company claiming a distribution edge.
Can it put a new product in front of its users at no cash cost? Meta can, through its own ad slots. Most companies pay someone else for that attention.
Does someone else control the last step? An app store, a retailer, a regulator. For Muse, it's the stores and brands. For Teams, it was Brussels.
Do users stay once the push stops? Distribution gets the download. Retention decides whether the download was worth anything.
A company that clears all 3 has a moat. One that only clears the first has a launch.
What I'm watching
Muse retention at 30 and 90 days, from Sensor Tower, Apptopia or Meta itself.
The transaction fee rate, once Meta sets one.
Amazon and Meta: a deal, a lawsuit, or Muse quietly routing around Amazon.
If distribution is the lens you want to practice with, Meta ($META), Amazon ($AMZN), Walmart ($WMT) and Shopify ($SHOP) are research starting points, each on a different side of the fight.
Stay disciplined, Koh
Disclaimer: Nothing in this email, the Reset and Invest newsletter, the Make Your Own Alpha book, or any course or digital product from Starshine Media LLC constitutes investment advice or a recommendation to buy or sell any security. Numbers and observations are as of publication. I may hold positions in companies discussed. Always do your own research and consult a licensed financial advisor before making investment decisions. I hold $META.