In the space of 48 hours, OpenAI broke free from Microsoft exclusivity to land on AWS, GM replaced Google Assistant with Gemini in 4 million cars, and Harvard dropped ChatGPT Edu in favour of Claude. The pattern is unmistakable: switching AI providers has become trivially easy at every level of the stack — cloud infrastructure, car dashboards, campus IT. For anyone building on top of AI, the implication is stark: your vendor relationship is a lease, not a mortgage, and the tenant can move out overnight.