{
  "id": "OPS-071",
  "slug": "ops-071",
  "title": "Group messaging needs a member opt-out and anti-abuse controls",
  "statement": "A group-messaging programme must let any member leave at any time, carry anti-abuse controls proportionate to the distribution size, and prevent recursive group messaging.",
  "rationale": "In a group thread the sender is not the only person who can reach the recipient, so the ordinary opt-out is not enough — a member who leaves can be added back by anyone else in the group, and a recursive group can amplify one message into thousands. The three controls exist together because each one alone is defeated by the other two failure modes.",
  "layer": "OPERATIONAL",
  "layerSlug": "operational",
  "object": "campaign.message_flow + campaign.description",
  "severity": "HIGH",
  "detectability": [
    "AI_FORM"
  ],
  "failureClass": "RETRY_FIELD",
  "authorities": [
    "CTIA"
  ],
  "applicabilityText": "Applies to every 10DLC registration.",
  "universal": true,
  "remediation": "Describe how a member leaves and stays left, what limits the size and rate of a distribution, and what stops a group creating another group. Done when the flow answers all three without the reader inferring any of them.",
  "example": "Any participant can reply STOP to leave a thread and cannot be re-added without opting in again; threads are capped at 25 participants, and participants cannot create new threads through the service.",
  "notes": "Applies only to group or multi-recipient threading, which the registration has no attribute for. The condition is carried in the criteria — the judge PASSes immediately where the campaign describes ordinary one-to-one messaging — and this note records that the applicability model could not express it.",
  "phase": "approval",
  "automated": true,
  "url": "https://ekas.io/rules/10dlc/operational/ops-071/",
  "markdown": "https://ekas.io/rules/10dlc/operational/ops-071.md",
  "registry": "https://ekas.io/rules/10dlc/",
  "updated": "2026-07-25",
  "licence": "CC BY 4.0 — https://creativecommons.org/licenses/by/4.0/"
}