You do realize "app" stands for application? You can't literally get a mod "app" lmao. And I don't sincerely know, but it's possible. You're not a god anymore
I am going to assume you would still have it. Your donor rank would probably be like a hidden rank that isn't displayed, but do not quote me on this.
Depends, if the mod has creative they are banned until creative/all the items are removed; some mods are also banned while they are re-evaluated for staff. Mishaps happen. I was demoted on Skyblock.net, Skyblock.org and MineVerse, however I'm still here and a mod again on Skyblock.org & net. !
I use to be God before I got promoted, and I lost all the perms for being a God when I did get promoted, so yes, you do loose your perms