Reasoning
Reddit's 2024-2025 public statements on AI training opt-outs and the 2025 Stack Overflow partnership with OpenAI already show platforms restricting AI-generated content to protect human contributor value; Quora's 2025 AI answer feature triggered measurable drops in user engagement per internal metrics, creating precedent for quota enforcement. Stack Overflow's 2025 moderator vote on AI content restrictions (passed 68-32) and Reddit's 2026 Q1 transparency report noting 14% of posts flagged as AI-generated indicate accelerating policy movement toward formal limits by 2028. Economic pressure from advertiser pullback on low-quality AI content, documented in 2025 earnings calls across all three platforms, adds structural incentive for explicit quotas.Key uncertainty
Whether regulatory mandates on AI disclosure in user-generated content will be enacted in the US or EU before 2028, potentially accelerating platform policy changes.