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The platform economy has fundamentally altered how firms define their organizational boundaries, shifting from traditional internalization logic toward permeable, digitally mediated structures. This theory-development article synthesizes recent scholarship on digital intermediation to propose a novel framework that explains how platform-based coordination reconfigures firm scope, market participation, and competitive strategy. Drawing on peer-reviewed studies, we argue that digital intermediation enables boundary permeability by reducing transaction costs, facilitating complementor integration, and enabling indirect governance without full ownership. We contrast platform participation with classical internalization, highlighting ecosystem governance mechanisms that expand organizational scope while preserving strategic autonomy. Five formal propositions articulate the causal pathways: digital interfaces increase boundary permeability; complementor orchestration substitutes for vertical integration; ecosystem participation redefines market entry modes; platform-mediated coordination lowers coordination costs across firm boundaries; and strategic repositioning in multi-sided markets enhances competitive advantage through selective boundary management. The resulting theory advances boundary theory by integrating digital intermediation as a core mechanism of scope transformation. Contributions include a dynamic model of ecosystem boundary dynamics and implications for managerial decision-making in platform environments. This conceptual work lays the foundation for future empirical validation in digitally mediated markets.