I very much agree with you, however, do you really think that Microsoft, of all companies, isn't using your data for training LLMs, with all the data leakage risks? What makes you think that your data is safer on OneDrive?

Bing Chat (based on ChatGPT), Copilot, etc. As a GitHub user, I never got a checkbox to opt-out of GitHub Copilot's training on my code. At least Dropbox provides a checkbox.