Data privacy doubts regarding using commercial LLM services like OpenAI

I've been working on integrating GPT3 API as well as ChatGPT into my business workflow, but I'm still hesitant about feeding data of any sensitive nature (example: client data or anything that may even vaguely relate to an NDA).

For those of you using commercial models-as-a-service for business applications, what are your thoughts on things like prompt data storage, and whether OpenAI will utilize customer prompt data to further train their model?

api applications as-a-service business business applications chatgpt client commercial customer data data privacy data storage for business llm may nature nda openai privacy service services storage things train working