Hi there! Happy to answer your question. The app has no cloud functionality and does not feed your work to train any AI. The only time it connects to the internet is to check the version number of the latest version to see if an update is needed. Your words entirely live on your computer's hard drive after you copy or export them and are 100% private and yours!
It does store your recent writing sessions as a part of the recovery feature, but these are also stored on your hard drive and never uploaded to the internet through the app. Additionally, no AI was used in the creation of the app. I hope this answers all of your questions :)