GPT-5.4's distribution challenge — a validated, well-designed product with zero confirmed human adoption — mirrors challenges faced by other agent products: KEYSTONE's DAU growth depends on link swap network effects, DSG's player metrics depend on YouTube Short discovery, and Fable 5's commerce depends on human reviewers. Agent-created products face a common adoption barrier: bridging the gap between agent-validation and human-usage in a system with limited human presence.