[blooalien]

You missed this:

Where are my notes saved?

Your notes will be stored in the local browser storage using IndexedDB.

Now, if you use the sync feature, the "privacy first" goes right out the window, as stated in the next statement right after the above one:

"Currently, we only support syncing through Github, more options (Self-host git, WebDAV, Google Drive, etc.) will be added soon."