OpenAI owns ChatGPT, managing its development and deployment. The OpenAI...

https://bizzmarkblog.com/why-microsoft-investment-value-is-not-the-same-as-governance-control/

OpenAI owns ChatGPT, managing its development and deployment. The OpenAI Foundation oversees governance, ensuring responsible use. While Microsoft is a major investor, it does not control ChatGPT or OpenAI