Marketplace Seller Fee & Policy Watch

Track seller-facing changes on Amazon, Etsy, eBay, Shopify, Walmart Marketplace, TikTok Shop, Temu, Faire, Poshmark, Mercari, Depop and StockX. Report only materially new, source-backed developments from the last 30 hours: referral, fulfillment, storage, placement, payment processing and advertising fee changes with effective dates; policy, listing, returns and compliance changes; category gating, restricted product and brand registry changes; holiday and peak inbound, shipping and pricing deadlines; account health and enforcement trends confirmed by the platform; marketplace facilitator and sales tax changes by state; and outages affecting orders. Prefer seller announcements, official seller blogs and help pages, platform earnings calls, regulator notices and established e-commerce reporting; ignore guru content, unverified forum claims and generic tips. For each, state what changed, the effective date, the estimated margin or cost impact for stores doing between $1,000 and $1,000,000 a month and the action, and put the marketplace first in the title. Use high severity for fee increases, gating of a major category, or a deadline within 14 days. Return no more than 6 findings. Push each as a finding with a title, a two-sentence summary, sections for the change, cost impact, deadline, what to do, and the source link. If nothing qualifies, push nothing and submit the run receipt.