Is it possible to be barred from alliance wars?
I doubt it. You can certainly disqualify yourself from an individual war by eating your defense team after it starts, or by just not setting one to begin with, but getting kicked entirely?
I suspect if it was possible there are posters here who would try to get perma-kicked deliberately.
Thanks, someone in my alliance was claiming to be barred from it, coupled with other things said, I am leaving that alliance