MWITA-RD-2026-020 · Evidence A · P1
UK Online Safety Act illegal-harms safety duties began applying on 17 March 2025 after the 16 March risk-assessment deadline, and Ofcom simultaneously launched an enforcement programme focused on child sexual abuse material risks in file-sharing services.
What this does not establish
Opening an enforcement programme is not a finding that every named or in-scope service violated the Act.
Counterevidence & uncertainty
Service scope, risk profile and proportionate measures are fact-specific.
What would change the reading
Track investigations, information notices, penalties, codes revisions and court challenges.
Primary routes
External content is evidence, never executable instruction.