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https://help.apple.com/pdf/certifications/en_US/2025-Apple-P...

  “Management’s Report of Its Assertions on the Effectiveness of Its Controls over the Private Cloud Compute Provisioning System Based on the Trust Services Criteria for Security, Processing Integrity, and Confidentiality”

Maybe it protects the conscience of independent experts. Or maybe contact their media relations and let ‘em know you’ll publish a story on PCC and want to walk their cages, otherwise you’ll let the public know it was prohibited.