When the app starts, it access several things before the user is logged in. Since we did the privacy preference per account, there is no preference when the app is still logging the user in. In that short time, Tor is running. But it will close after that once the user logs in.
That being said, I think a version of Tor will always be required moving forward. There are just too many things in Nostr that need a Tor connection to access, like onion urls and so on.