ChatGPT is developed and owned by OpenAI, a research organization focused on AI...

https://garrettsinsightfulchat.wordcanopy.com/posts/who-provides-chatgpt-service-in-switzerland-a-deep-dive-into-openai-s-european-presence

ChatGPT is developed and owned by OpenAI, a research organization focused on AI technology. The OpenAI Foundation oversees its governance to ensure responsible development. Microsoft holds a significant investment stake but does not own or control ChatGPT