App Store review rejected our app under Guideline 1.2 — the core mechanic (users rate each other's photos) is banned as a category, and no metadata change fixes that. So we became one of the first apps distributed exclusively through an alternative marketplace under the EU's DMA. Documentation for this path is thin and sometimes contradictory, so here is a step-by-step of what actually had to be done.
Step 1. Alternative Terms Addendum
You sign an addendum to the developer agreement in App Store Connect. You don't need to be an EU resident. Distribution is free up to 1M first annual installs (companies under €10M revenue get the Core Technology Fee exemption).
Step 2. Registering with the marketplace
AltStore has a REST API to register your developer ID — important: it's the UUID from your ASC profile, not the Team ID (registering with the Team ID silently fails — we stepped on that). The token goes into ASC: Users and Access → Integrations → Marketplaces.
