Meta terminology
IDPC
Irish Data Protection Commission
Meta's lead data-protection regulator in the EU, by virtue of its Irish establishment. An escalation over rolling back the protection that stops 18-20-year-olds messaging minors counts, among the costs of doing so, having to brief "regulators like the IDPC, FTC and ICO to flag the change (therefore disclosing the gap)."
Sources
Internal documentUnsealed internal messages ("IG adult > minor DM escalation a/c priv")
Internal documentUnsealed internal messages ("shouldn't do proactive enforcement unilaterally")