Meta's Muse agent, which can go to online stores and buy things for you, is free to use up to a weekly limit. Meta plans to pay for it with a small fee from stores each time Muse completes a purchase. That means the person Muse works for is not the person paying for it.
Free means someone else is the customer
Giving every user a cloud computer with a browser costs real money each time the agent runs. Meta can carry that cost because its advertising business is large, and it expects the stores to pay it back. OpenAI's Dots, the always-on agent inside ChatGPT, goes the other way. It starts at $100 a month, so the person who uses it is the person who pays. Neither price is wrong. They answer the question of whom the agent works for in opposite ways, and that answer shapes every recommendation it makes.
The last time a shopping tool changed sides
When Google's shopping search turned into a paid listing service in 2012, it described bids as one extra factor next to relevance. That is how paid ranking usually arrives: as a small weight, never as a takeover. People kept using it, because a list with a slight tilt is still a list, and you can see the other nine results.
An agent takes that safety away. Ask Muse for a rain jacket under $120 and you get one jacket from one store, with a button to approve it. The stores it can choose from are also a short list. It shops at Walmart, Best Buy, Gap, Sephora and Wayfair, uses Expedia for travel and Instacart for groceries, and Amazon has blocked it from buying. Every store on that list has set up a connection with Meta, and every one is the kind of business that would pay a fee.
Meta has not said the fee will change what Muse picks. I expect it will, the way bids changed Google's results: as a small weight at first, and with no label on the page. A household that buys $500 a month through an agent and is steered to prices 3% higher loses $15 a month, or $180 a year, and never sees a single purchase that looks wrong.
Where a seller-paid agent is safest
The risk sits in choosing between sellers. It is much smaller when the job is checking facts about your own accounts: whether you still use a streaming subscription, whether a refund is owed, whether the phone bill can come down. There is no list of stores to tilt, only a record to read and a form to fill in. That is also where an agent saves the most time, because those are the chores people put off for months.
So the sensible split is easy to follow. Let the agent do the finding and the cancelling. When it reaches the approval screen for a purchase of any size, open one other store and compare the price. It takes two minutes, and it is the same check you would make against a sponsored result on a search page.
The agent already asks before it spends, and that approval step is the one place where you can still compare.