The Platform Dependency Question   Companies implementing AI agents worry about platform provider stability. What happens if OpenAI, Anthropic, or Twilio changes pricing, reduces service quality, gets acquired, or shuts down?    Understanding platform risk, mitigation strategies, and switching costs prevents both paralysis and reckless dependency.      The Platform Stack   Layer 1: AI Foundation Models   Providers: OpenAI (GPT-4), Anthropic (Claude), Google (Gemini)  What th