Why did Amazon block Meta's Muse from its marketplace?

Mike Todasco argues that Amazon's recent move to block Meta's Muse agent from its marketplace is explained by advertising economics rather than catalog protection. He writes that "the Amazon.com marketplace makes more profit from advertising than it does from actually selling goods. So it is little surprise that Amazon recently blocked Meta's Muse from accessing their site." His framing: Amazon can absorb "giving up a bunch of low-margin sales," but "the problem for them is that AI agents don't click on ads."

The mechanism he gives is a mismatch between what the agent optimizes for and what the platform is paid for. Sponsored placement only earns Amazon money if a human attention span lands on it and clicks; an agent sent to find the cheapest matching product has no reason to notice a sponsored listing at all. In his words, "to keep its margins, Amazon needs you to click on ads, not just have agents find the cheapest stuff." He places this alongside a second, related case in the same essay — Negative-Option-Billing companies (Planet Fitness, Chewy, Allstate) reportedly seeing falling share prices since Muse's release — as evidence that agent-mediated shopping is already forcing defensive moves from businesses whose margin depends on specifically human behavior, whether that behavior is clicking an ad or forgetting to cancel a subscription.

This is the same essay's companion case to Will AI agents destroy the negative option billing business model?: both describe a company's margin resting on a human quirk — inattention to ads, or forgetfulness about cancellation deadlines — that an agent simply does not have. It also extends Will brands succeed by building their own AI shopping agents? with a counter-case: rather than competing to become the agent's choice, Amazon's response was to exclude the agent outright, a defensive option Accenture's framing does not name. And it parallels Is non-human traffic really half of all internet use?, where publishers facing the same loss of human-attention-dependent revenue chose licensing deals instead of outright blocking — a different adaptation to the same structural pressure.

The excerpt does not establish Amazon's actual motive: Todasco infers the ad-revenue explanation ("little surprise") rather than citing a statement from Amazon, and gives no figures for what share of Amazon's profit advertising actually represents or how much click-through Muse-style agents would in practice forgo. The blocking itself is reported as a recent fact, but the causal account connecting it to ad economics is the essay's own interpretation. The implication — that ad-supported marketplaces face a structural incentive to exclude agents even at the cost of sales — is plausible from the mechanism described, but it rests on one company's unconfirmed reasoning, not on disclosed internal data.