Data Flywheel describes a self-reinforcing cycle where financial institutions leverage customer data with AI to improve products, driving higher engagement and generating more data—creating compounding competitive advantage. This dynamic is reshaping banking competition fundamentally: accumulated historical customer data cannot be easily replicated by competitors or new entrants, even with superior AI technology. Global financial institutions are investing massively ($760B in 2025, growing to $1.1T by 2029) to become data-rich, creating a winner-take-most dynamic where data depth and ecosystem strength now matter more than branch networks or brand alone. This is critical for Thai SMEs and fintech players to understand as regional banking consolidates.