I agree my initial comment was oversimplified, but what you say is not fact but only concern contradicts Apple's own statements about what data they share with 3rd parties under the Apple Intelligence product.
If putting "OpenAI must process your information solely for the purpose of fulfilling your request and not store your information or any responses it provides unless required under applicable laws. OpenAI also must not use your information to improve or train its models." on their website is enough of a guarantee for you that OpenAI won't do what they please, then good luck.