Charles admits that Coinbase (and Gemini) currently dominate the card market because they have the "crypto everything card" and a massive existing user base. While Rain builds B2B infrastructure, Coinbase owns the B2C relationship. In a world where "1% of US dollars are stablecoins" grows to 10% or 50%, the primary consumer interface (Coinbase) captures the float, the interchange, and the user data. They are the "super app" incumbent that niche cards must compete against. LONG. They are the default winner of US-based stablecoin adoption. Fee compression; loss of market share to vertical-specific fintech apps.