No, I meant that as you become Lord of the region, the region stays in the same realm, and you are the one who switches realm.
If the region is a border region of your own realm, you can immediately switch back if that's what you want to do.
But outside of the context of single-realm religion, it's not immediate that it would result in an insta-ban. After all, it means that you do swear allegiance to your new ruler. You are, very much, switching realm. And, in an ideal world, if banned you can take your region with you... that may convince some realms they are better working with you.
If you RTO a region in the middle of enemy territory, sure, you will probably be insta-banned. You shouldn't have RTOed the region in the first place.
