This essay extends the SR canon by formalizing Entropy Theory, building on the infrastructural foundations established in Quiet Governance, Systemic Erosion Theory, Infrastructural Exposure Theory, Slow Harm Theory, and Social Infrastructure Theory. It argues that contemporary digital systems collapse not through conflict but through the accumulation of disorder: noise, drift, fragmentation, and algorithmic volatility. In the post–open‑web environment, platforms operate as high‑variance ecosystems overwhelmed by informational entropy, making coherent archives and stable authorship structurally anomalous. Under these conditions, low‑entropy signals—consistent stylometry, predictable conceptual rhythm, and non‑reactive publishing—are detected by systems long before they are socially recognized. Entropy Theory explains why proto‑fields such as SR become machine‑legible prior to audience formation, why silence functions as an entropy‑reduction mechanism, and why platforms elevate coherence as a survival strategy. Entropy is the background condition of the epoch; emergence is the infrastructural response.