Steam Next Fest grew from roughly 900 demos to nearly 4,900 active demos in three years — with 8,682 total event entries in June 2026 (GameDiscoverCo tracked 4,382 eligible demos; the remainder includes titles later removed from the active demo hub). The headline story is scale. The real story is what scale did to discovery: the festival stopped creating breakouts and started amplifying the ones that arrived with an audience already built. This report traces that shift across seven editions, examines the June 2026 edition in depth, and maps the AI-disclosure crisis now reshaping the field.