Mmmh, I don't think the app ever got disabled by Android during my days of testing (I actually reinstalled yesterday and having a look again, battery drain seems a bit better now so far ... ). But obviously a system service is always gonna be prioritised higher than a user app. But as I said I didn't have this problem with this app (actually the only one I can think of is Syncthing and with that I'm not sure if it's not the app going to a sleep mode or something by itself).