Reasoning
The EU is actively developing AI regulation frameworks with mandatory transparency requirements (AI Act proposals include disclosure obligations for synthetic content), and the Digital Services Act already requires platform accountability for content moderation. The UK, Canada, and several US states are considering similar disclosure requirements. Historical precedent shows EU regulations typically achieve implementation within 4-6 years of formal proposal (GDPR took 4 years), and AI transparency requirements are explicitly mentioned in multiple 2023-2024 policy documents. However, "enforceable across platforms" creates higher complexity than single-country implementations, and technical standardization challenges could delay universal adoption. The 2029 timeframe aligns with expected EU AI Act enforcement phases (2025-2026 initial, 2028-2029 expansion).Key uncertainty
Whether enforcement mechanisms will have sufficient cross-border teeth to compel compliance from non-EU platforms (particularly US-based companies), which could result in fragmented regional requirements rather than truly enforceable global standards by 2029.